Abu Dhabi, United Arab Emirates. STANDARD CONSTRUCTION SPECIFICATIONS (PART 1 - ROADS, Second Edition 2020)

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12. Brightness adaptor shall be continuous and automatic from 100 % to 10 %

d. Temporary Barriers

The Contractor shall be responsible for furnishing, installing and maintaining all temporary barriers
in areas as determined by the Engineer, where construction operations result in a condition that is
considered  to  be  hazardous  to  the  general  public,  or  to  separate  the  work  area  from  pedestrian
areas.  Location  and  extent  of  the  temporary  barriers  shall  be  as  directed  and  approved  by  the
Engineer. Temporary barriers shall remain the property of the Contractor and shall be removed from
the site of the works as approved by the Engineer when no longer required. Temporary barriers may
be of the following:

1. Temporary concrete barriers

2. Temporary concrete barriers with screens

3. Water filled portable barriers

4. Safety barrier fence system

1. Temporary Concrete Barriers

Temporary  concrete  barrier  shall  be  new  or  used  precast  barrier  complying  with  the
requirements  of  the  Contract  plans  for  precast  barrier  and  meeting  the  requirements  of
Section 7.5 of Chapter 7, Incidental Construction, except for the following:

Lengths may differ from those shown in the Contract plans

Permanent lifting holes less than 100 mm in diameter may remain

Lifting loops are permitted

A stamp or stencil reading “temporary” shall be visible on each barrier segment

Permanent barriers that will be removed and reset per the Contract plans or the direction of
the engineer may be used as temporary concrete barrier without being stamped or stencilled
“temporary.” Any permanent barrier damaged during its use as a temporary barrier will
become the property of the Contractor and be replaced with an undamaged permanent
barrier at no expense to the Owner when the permanent barrier is reset to its location.

All barriers shall be in good condition, without cracks, chips, spalls, dirt, or traffic marks. If
any barrier segment becomes damaged during or after placement, the Contractor, at no
expense to the Owner, shall immediately repair it to the engineer’s satisfaction or replace it
with an undamaged section.

As soon as the temporary barrier is no longer needed, the Contractor shall remove it from
the site of the works. Owner-furnished barrier shall remain Owner property, and the
Contractor shall deliver it to a stockpile site noted in the contract or to locations approved by
the engineer. The Contractor-furnished barrier shall remain the property of the Contractor.

2. Temporary Concrete Barriers with Screens

Temporary concrete barriers shall meet the requirements of Paragraph 1 above. The
Contractor shall be required, when directed by the Engineer, to provide warning lights and
reflective painted markings on continuous temporary barriers in areas where detour
pavement is poorly illuminated.

Screen shall be constructed of painted metal and shall be neat in appearance. Screen shall
be fixed over the temporary concrete barriers. Screen shall be solid and continuous, not less
than 1.2 m in height. Supplemental screens shall be connected with the metal screen as
indicated on the Contract plans and as directed by the Engineer. Details of construction shall
be as indicated on the Contract plans and approved by the Engineer. Screen shall be of
substantial construction such that it will not be damaged or displaced by wind or other normal
natural or manmade forces.

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Slots shall be provided in temporary concrete barriers for fixing screens as indicated on the
Contract plans.

3. Water Filled Portable Barriers

Barrier shall be a highly portable and crashworthy longitudinal barrier. Barrier section shall
be constructed of a lightweight, recyclable, virgin linear low density polyethylene plastic shell,
with ultraviolet stabilisers and antioxidants, designed to accept water ballast. End of each
barrier section shall be constructed with vertically aligned knuckles which interlock with
adjacent sections by means of a steel connecting pin. Connecting pin shall be constructed to
securely connect adjoining sections.

Barrier sections shall be constructed in white or work zone safety orange colours for high
visibility. Each barrier section shall include an internal galvanised steel framework to provide
additional rigidity during handling and impacts. Barrier section shall have ribbed sidewalls to
interact with an impacting vehicle in a manner that resists penetration, vaulting and under
riding.

Barrier sections shall have elevated forklift openings to allow for mechanical lifting when
empty or full. Barrier shall have arrangements like quick fill openings with covers, and a rapid
release gate valve to allow quick draining of the water ballast. A reflectorised fill level indicator
shall be constructed in the top of each section to allow quick verification that the section is
adequately full of water ballast.

4. Safety Barrier Fence System

Safety barrier fence system type A shall have the following salient features:

Constructed of galvanised steel, with red/white banner planks

ii.

Overall dimensions: 2,000 mm by 1,000 mm

iii.

Universal base plate K1 weighing approximately 28 kg

iv.

Galvanised steel support posts

Complete with a transport and storage box for up to 20 barrier elements having 2,000
mm by 1,000 mm dimension

vi.

System shall be supplied by M/s Nissan or approved equivalent

Safety barrier fence system type b shall have the following salient features:

Constructed of high quality plastic, with upright tubes made from galvanised steel
parts with red/white barrier planks and blind man’s rail with retroflective foil, Type 1

ii.

Include facility to mount warning lamps

iii.

Banner element shall be 2,000 mm by 1,000 mm

iv.

Universal base plate K1 weighing approximately 28 kg

Galvanised steel support posts

vi.

Complete with a transport and storage box for up to 20 safety barriers elements
having 2,000 mm by 1,000 mm dimension.

vii.

System shall be supplied by M/s Nissan or approved equivalent

viii.

This system shall also include monolight LED warning lamp and battery. Salient
features of the monolight shall be as follows:

a) Light type: Flashing/constant

b) Light Intensity: 15 cd

c) Light Colour: Amber

d) Light Flash Rate: 60 f/min to 70 f/min

e) Light Direction: 2 sided

f) With LED roadwork lamp with one battery, LED unlimited life

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g) With bracket for mounting on 54 mm diameter vertical tube

h) Salient features of 1 dry cell battery shall be as follows:

1) Continuous light: 300 hours

2) Flashing light: 1,200 hours

i) Salient features of the 1 battery konstant 25 shall be as follows:

3) Continuous light: 950 hours

4) Flashing light: 3,800 hours

e. Temporary Crash Cushions Systems (Attenuators)

The Contractor shall be responsible for furnishing, installing and maintaining all temporary detour
crash cushions in areas as shown on the Contract plans and required by the Engineer. Location of
the crash cushions shall be as directed and approved by the Engineer. The Contractor shall
dissemble and remove the temporary detour crash cushions as directed by the Engineer. All crash
cushion systems shall meet the requirements of the relevant sections of NCHRP 350.

The Contractor shall be responsible for maintaining local stock of routine impact kits for all types of
crash cushions, which are as part of the temporary safety design features.

1. Truck-mounted Attenuator

Truck-mounted attenuators (TMAs) shall be mounted on a vehicle with a minimum weight of
6,800 kg and a maximum

weight in accordance with the manufacturer’s recommendations.

Ballast used to obtain the minimum weight requirement, or any other object that is placed on
the vehicle shall be securely anchored such that it will be retained on the vehicle during an
impact. The Contractor shall provide certification that the unit complies with NCHRP 350 Test
level 3 requirements.

TMAs shall have an adjustable height so that it can be placed at the correct elevation during
usage and to a safe height for transporting. If needed, the Contractor shall install additional
lights to provide fully visible brake lights at all times. TMA units shall have a chevron pattern
on the rear of the unit. Standard chevron pattern shall consist of 100 mm yellow stripes,
alternating non-reflective black and retro-reflective yellow sheeting, slanted at 45 degrees in
an inverted-V with the V at the centre of the unit.

2. Type 1 Crash Cushions: Redirective, Non-grating

Crash cushions at gore position as shown on the Contract plans shall be redirective, non-
grating, comprising of a cartridge assembly units, meeting NCHRP 350, Quadguard® from
M/s Quixote Corporation or equivalent as approved by the Engineer.

If required, the Engineer shall review the structural and performance based integrity of a
crash cushion after an accident, and shall determine the number of elements to the crash
cushion which need to be replaced. Elements and assembly units of a crash cushion shall
be replaced by the Contractor with genuine parts from the original manufacturer, as approved
by the Engineer. All replaced elements/assembly units after an accident shall be such that
the reconstructed crash cushion system meets the NCHRP 350 standards in accordance
with the manufacturer’s recommendations and Engineer’s approval.

3. Type 2 Crash Cushion: Non-redirective

Crash cushion at the gore positions next to the temporary portable barriers on detours shall
be shall be React 350 (Reusable Energy Absorbing Crash Terminal) from M/s. Quixote Corp.,
or an equivalent as approved by the Engineer. This crash cushion shall be redirective, not-
gating, reusable make up from arrays of cylinders that have the ability to recover a major
portion of their shape, position and capabilities after being impacted meeting NCHRP 350.

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f. Portable Steel Barrier Gate

The Contractor shall be responsible for furnishing, installing and maintaining all portable steel barrier
gates at emergency median crossovers and in detour areas as shown on the Contract plans or as
directed by the Engineer. Portable steel barrier gates shall be Vulcan Barrier/Gate System from M/s.
Quixote Corp. or equivalent as approved by the Engineer. Portable steel barrier gate shall be steel
longitudinal barriers pinned securely to each other and shall meet the NCHRP 350 standards.

All fabrication, metal work, bolts, nuts, and washers shall be galvanised. If required, the Contractor
shall replace damaged elements of portable steel barrier gate with genuine parts from the original
manufacturer, approved by the Engineer.

g. Directional Safety Beacon System

Furnishing, installing, and maintaining all directional safety beacon systems in areas as determined
by the Engineer shall be the responsibility of the Contractor. Locations of the directional safety
beacon systems shall be as directed and or approved by the Engineer.

Directional safety beacon system shall have the following salient features:

Safety beacons shall be one sided, either left or right with an integrated, amber warning

light

Warning light shall be 5 joules, 180-mm-diameter, high-luminous intensity, with an

integrated fault indicator

Auto solar switch and 1- 6V battery in the beacon housing unit.

Stripe sheeting shall be red/white, Type 2, in accordance with EN 12352-L7

Black base plate weighing minimum 28 kg

Systems shall be as pro9vided by M/S Nissan or an equivalent, as approved by the Engineer.

h. Temporary Signage

All temporary signs and appurtenances shall be furnished, installed, maintained, and removed on
completion of the works where shown on the Contract plans or required by the Engineer, including
the following locations:

1. Where roads are closed, partially closed, or where work is in progress

2. Where required to direct, inform or assist traffic in the area of construction

Temporary signs shall be placed at locations shown on the Contract plans and as directed by the
Engineer to direct traffic smoothly and safely.

The Contractor shall submit specimens of signs for approval by the Engineer. The Contractor shall
relocate all temporary signs as required by the construction stages or steps and his sequence of
construction operations.

Drawings and signs as specified herein are stated in the English language. The Contractor shall
provide equal signs in size and description in Arabic at the same locations. Signs in Arabic shall be
mounted adjacent to the English signs and as directed by the Engineer.

Temporary  signs,  panels,  and  supports  shall  be  either  wood  or  metal  and  shall  be  substantially
constructed to withstand the climatic conditions of Abu Dhabi. All types of sign panels shall be high
intensity grade reflective sheeting.  The Contractor shall submit samples of  the proposed types of
sign  panels  and  supports  for  approval  of  the  Engineer  prior  to  the  fabrication  and  erection  of
temporary signs. All posts shall be suitably anchored and as approved by the Engineer.

This item shall be in accordance with Abu Dhabi

’s Manual of Uniform Traffic Control Devices (AD-

D-11), and shall be of the exclusive colours as illustrated in the Contract plans. All temporary warning
signs for detour arrangements and work zones adjacent to live road traffic shall be made from high
intensity reflective sheeting, in accordance with ASTM Type III.

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Type III reflective sheeting shall consist of spherical or prismatic lens elements adhered to a synthetic
resin and encapsulated by a flexible, transparent, weatherproof plastic having a smooth outer
surface.

Sheeting shall conform to the applicable day time colour and luminance factor requirements of ASTM
D 4950 when tested instrumentally or the diffuse day colour of the reflective sheeting shall be visually
evaluated by comparison with the applicable highway colour tolerance chart.

Reflective  sheeting  shall  have  the  following  minimum  coefficient  of  retroreflection  values  at  0.2
degrees  and  0.5  degrees  observation  angle  expressed  as  average candelas  per foot-candle,  per
square foot of material. Measurements shall be conducted in accordance with ASTM E 810.

Table 1-3: Type III glass bead retroreflective element material for temporary signs

Observation
Angle

Minimum Retroreflection (candelas/ft-cd/ft

)

Entrance Angle

Silver

White

Yellow

Orange

Green

Red

Blue

Brown

0.2

-4

250

170

100

0.2

+30

150

100

8.5

0.5

-4

7.5

5.0

0.5

+30

5.0

3.5

Sheeting shall conform to the applicable daytime colour and luminance factor requirements of ASTM
D4956  when  tested  instrumentally.  Or  the  diffuse  day  colour  of  the  reflective  sheeting  shall  be
visually  evaluated  by  comparison  with  the  applicable  Highway  Colour  Tolerance  Chart.  Colour
comparison shall be made under north daylight or a scientific daylight having a colour temperature
from 6,500 kelvin to 7,500 kelvin. Daytime colour evaluation shall be illuminated at 45 degrees and
viewed  at  90  degrees.  There  shall  be  no  significant  colour  shift  when  viewed  under  night-time
(retroreflective) conditions.

Reflective sheeting shall have a pre-coated pressure sensitive adhesive (Class 1) or a heat-activated
adhesive (Class 2) either of which will adhere to flat, clean surfaces without necessity of additional
adhesive coats on the reflective sheeting or application surface. Chemical activators shall not be
used to activate Class 2 adhesive.

Pre-coated adhesive shall be protected by an easily removed liner which, when removed, shall not
have a staining effect on the reflective sheeting and shall be mildew resistant. Protective liner
attached to the adhesive shall be removable by peeling without soaking in water or other solvents
and shall be easily removed after storage for 4 hours at 815

C under weight of 1482 kPa. Sheeting

with liner removed, conditioned for 24 hours at 382

C and 50 % relative humidity, shall be sufficiently

flexible to show no cracking when bent around a 30.5-mm-diameter mandrel with the adhesive side
contacting the mandrel. For ease of testing, talcum powder may be spread on the adhesive to
prevent sticking to the mandrel.

Sheeting surface shall be smooth and flat to facilitate self-cleaning in the rain, regular cleaning, and
wet performance, and exhibit 85 degrees glossmeter rating of not less than 50 when tested in
accordance with ASTM D523. Sheeting surface shall be readily processed and compatible with
transparent and opaque process colours and show no loss of the colour coat with normal handling,
cutting, and application. Sheeting shall permit cutting and colour processing at temperatures of 315

C to 538

C and 20 % to 80 % RH.

Sheeting shall be heat resistant and permit force curing without staining of unapplied sheeting or
applied sheeting at temperatures recommended by the manufacturer not to exceed 815

C for

unapplied sheeting or 1,093

C for applied sheeting. Sheeting surface shall be solvent resistant to

permit cleaning by wiping with a clean soft cloth dampened with VM & P Naphtha or mineral spirits.

Adhesive shall form a durable bond to smooth, corrosion and weather resistant surfaces and permit
the reflective sheeting to adhere securely, 48 hours after application at temperatures of -184

C to

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1093

C. Adhesive bond shall be sufficient to render the applied sheeting vandal-resistant and

prevent its shocking off when subjected to impact energy of 13.6 joules applied with a hemispherical
tipped object 25 mm in diameter at -18

C. Test specimen shall be applied to aluminium backing not

less than 2.0mm thick and having a dimension of not less than 2,580 mm2. During testing, the
specimen shall be supported on a 75 mm diameter ring. Adhesion test shall conform to ASTM D4956
with the addition of the temperatures noted herein.

Resistance to accelerated weathering shall be as described in ASTM D4956 except the weathering
apparatus and procedure shall be in accordance with ASTM G 154.

Reflective sheeting shall be sufficiently flexible to be cut to shape easily and permit application over,
and conform to, moderate shallow embossing characteristic of certain sign borders and symbols.
Following liner removal, the reflective sheeting shall not shrink more than 0.79 mm in 10 minutes or
more than 3 mm in 24 hours in any dimension per 5,800 mm2 at 382

C and 50 % relative humidity.

Sheeting, when applied according to manufacturer’s recommendations to cleaned and etched 0.50
mm by 50 mm by 200 mm aluminium, conditioned (24 hours) and tested at 382

C and 50 % humidity,

shall be sufficiently flexible to show no cracking when bent around a 19mm diameter mandrel.

Reflective sheeting shall be applied in the manner specified by the sheeting manufacturer. Applied
sign face shall not have bubbles, wrinkles, or foreign material beneath the reflective sheeting.

All edges and splices of reflective sheeting signs shall be coated with an edge sealer when
recommended by the manufacturer of the reflectorised sheeting.

Splicing of reflective sheeting shall not be permitted on signs or panels with dimensions up to and
including 1.2 m in height or width unless the reflective sheeting specified does not come in this width,
then the widest width material shall be used. When sheeting joints are required, they shall be lap-
jointed with the top sheet overlapping the bottom sheet by no less than 4.75 mm. Fabricator shall
endeavour to use the least number of seams possible with the horizontal lap preferable. Roller
applied or reverse screened sheeting may be butt-jointed with joint gap not to exceed 0.8 mm. Colour
matching of adjacent sheets of reflective sheeting comprising a sign shall be accomplished without
a noticeable difference in colour. No borders shall be spliced other than the splice of the tangent
border to the corner radius.

Demountable prismatic reflectorised message and borders shall have the following characteristic:

Letters, digits, and alphabet accessories shall consist of embossed 10.2 mm thick sheet aluminium
frames  confirming  to  ASTM  B209  grade  3003-H14  in  which  prismatic  reflectors  are  installed  to
prevent  their  displacement  in  handling  or  service.  Letters  in  which  reflectors  are  assembled  by
means of tape are unacceptable. Plastic reflectors face shall be colourless and be entirely smooth
to  present  a  water repellent  and  dirt  resistant  surface.  Area  indicating  the  letter  shape that  is  not
reflectorised shall be white for maximum daytime contrast with the sign background. All letters shall
be free of any imperfections and shall present a high quality appearance. Demountable prismatic
border shall be comprised of a minimum length of  600 mm with allowance of one shorter section
between each corner radius.

Letters shall be fastened to the sign with aluminium screws or blind rivets conforming to ASTM B209
grade 2024-T4.

Co-efficient of retroreflection of each reflex reflector intended for use in cut-out letters, symbols, and
accessories shall be equal to or exceed the following minimum values with measurements made
with reflectors spinning.

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Table 1-4: Coefficient of retroreflection of reflex reflectors for use in cut-out letters and

symbols

Observation angle

(degrees)

Entrance angle

(degrees)

Co-efficient of retroreflection candle

power/square inch/foot candle

0.1

14.0

0.1

5.6

Failure to meet the specific minimum values shall constitute failure of the reflector being used. Upon
failure of more than 2 of the 50 samples tested, a resample of 100 reflectors shall be tested. Failure
of more than 4 of these samples shall be cause for rejection of the lot.

Maintenance  of  all  signs  furnished  shall  include,  but  not  by  way  of  limitation,  all  restoration  or
replacement  of  reflective  sheeting,  replacement or  other  work  required to  maintain the  signs  in a
condition and position as approved by the Engineer.

At the completion of construction or when directed by the Engineer, all signs shall be removed and
disposed of by the Contractor.

i. Construction Identification Signage

The Contractor shall provide and maintain and remove, when directed by the Engineer, construction
identification signs for the site as per the requirements of Section 1.15.8. These wooden signs shall
be constructed of 7 separate panels as shown on the Contract plans with an overall size of 2.60 m
wide by 3.15 m high, all painted with 2 coats of white oil paint back and front and supported 0.60 m
above the ground with galvanised steel angle, pipe or tubular framing and struts painted gray or
silver and set into the ground and fixed in concrete foundations for adequate support.

Boards shall be lettered in both Arabic and English to include the information as indicated on the
Contract plans and as approved by the Engineer.

A large scale layout  shall be submitted for approval before manufacture. No advertising material,
other  than  the  above,  will  be  permitted.  Temporary  construction  identification  signs  shall  be
maintained in good condition, repainted as directed by the Engineer and removed from the site at
the  end  of  the  Contract  to  be  disposed  of  as  approved  by  the  Engineer.  Siting  and  layout  of
subcontractors’ and manufacturers' signs shall be approved by the Engineer.

Construction identification signs shall be placed at approaches or the beginning of construction on
roads as directed by the Engineer.

j. Temporary Light Standards

Temporary lighting for detour pavements or other detour areas shall be as required or as directed
by the Engineer. In all possible cases, the Contractor shall make use of the existing or newly installed
permanent lighting system to provide temporary lighting for the detour pavements or areas. When
directed by the Engineer, the Contractor shall furnish and install, or install, temporary light standards
complete as specified herein.

Temporary light standards (poles) shall be 10 m high with one 250 watt High Pressure Sodium (HPS)
lantern  and  shall  be  installed  staggered  on  both  sides  of  the  temporary  detour  pavement  or  as
approved by the Engineer. The lighting levels and uniformity for temporary light standards shall be
as  included  in  Section  10.8,  Lanterns  (HID  and  LED)  and  Ornamental  Lighting,  of  Chapter  10,
Lighting and Electrical Distribution Works. The pole height and wattage of the lantern included herein
are  for  guideline  only.  The  Contractor  can  propose  the  lighting  system  as  per  detour  areas.
Temporary  light  standards  shall  be  furnished  and  installed  by  the  Contractor  as  approved  by  the
Engineer.

The Contractor shall make all necessary arrangements for power supply for the temporary lighting
system including furnishing and installing all cables, control switches and all related appurtenances
required per Abu Dhabi Water and Electricity Authority (ADWEA) regulations for the power supply

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and all electric power required to operate the temporary light standards. The Contractor shall submit
shop drawings with all details of the proposed temporary lighting system to the Engineer for approval.

The Contractor shall furnish and install 10 m high temporary light standards for areas as shown on
the approved detour/staging drawings, complete with all components, including but not limited to,
single  250  watt  HPS  lanterns,  ballasts,  lamps,  cables,  concrete  foundations,  base  plates,  anchor
bolts,  reinforcement  steel,  concrete,  PVC  conduit,  controllers,  control  cabinets,  all  related
appurtenances and power supply. Temporary lighting system shall be maintained by the Contractor
at all times until removal is directed or approved by the Engineer.

The Contractor shall maintain the temporary light standards and all light standards damaged by
accidents or for any other reason shall be replaced at the Contractor

’s expense and at no cost to the

Owner.

When temporary light standards and all related appurtenances as specified herein are no longer
required on the site or when directed or approved by the Engineer, the Contractor shall remove all
such temporary light standards from the site which shall become the property of the Contractor and
be disposed of as approved by the Engineer.

Existing or newly installed street lighting system shall be incorporated wherever possible for lighting
of temporary detour pavement and other detour areas as required or as directed by the Engineer.
The Contractor shall make all necessary arrangements with ADWEA; make all payments of any fees
or power charges; make modifications to the existing lighting system if required; and maintain and
operate the existing or newly installed lighting system for all required temporary detour areas.

The Contractor shall install and supply any additional temporary light standards, cables, controllers,
control  cabinets  and  appurtenances  as  necessary  to  provide  for  the  complete  temporary  detour
lighting  system,  while  incorporating  existing  or  newly  installed  street  lighting  standards  where
possible, as approved by the Engineer.

The Contractor shall relocate temporary or existing light standards as indicated on the Contract
plans, as specified herein and as directed by the Engineer. Relocation of temporary or existing light
standards shall be complete with light standard, lantern, cable, power, and all appurtenances.

k. Temporary Signals for Traffic and Pedestrians

The Contractor shall furnish, install, maintain, and remove temporary traffic signals as indicated on
the Contract plans, as specified herein, and as directed by the Engineer. All temporary traffic signal
poles shall be furnished and maintained with the number of traffic signal units (heads) consisting of
red, amber and green signals as directed by the Engineer. Traffic signal units (heads) proposed by
the Contractor shall be capable of manual operation as well as standard fixed phase operation from
a local controller.

Installation of temporary traffic signals shall be complete with all poles, traffic signal units, conduit,
wiring, electric power to all control units and traffic signal units and all appurtenances required for
the operation of all units as approved by the Engineer.

The Contractor shall submit all details of proposed temporary traffic signals to the Engineer for
approval prior to construction. The Contractor shall maintain all temporary traffic signals and replace
any defective or damaged units at no cost or expense to the Owner.

Owner reserves the right to direct the Contractor to obtain all materials, except cables and wiring,
for the temporary traffic signals from the Owner. The Contractor shall obtain poles, traffic signal units
(heads), controls, and appurtenances, as directed by the Owner, from the designated Owner store
yard. The Contractor shall load, transport, unload, and install all such temporary traffic signal poles,
complete.

The Contractor shall furnish and install all conduit, cables and/or wiring and electric power to all
temporary traffic signal poles and control units required for the operation of all units as approved by
the Engineer.

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When the temporary traffic signals and all related appurtenances are no longer required on the works
or when directed or approved by the Engineer, they shall be removed by the Contractor and materials
obtained from the Owner returned to the Owner. All such temporary traffic signals and
appurtenances shall be carefully removed, cleaned and suitably protected. Such equipment shall be
loaded, transported, unloaded and placed in storage where directed by the Engineer or the Owner.

Temporary traffic signals supplied by the Contractor shall remain his property at completion of the
Contract, and shall be removed from the site and/or disposed of as approved by the Engineer unless
otherwise specified in the particular specifications.

1. Relocate Temporary Traffic Signals

The Contractor shall relocate temporary traffic signals as indicated on the Contract plans, as
specified herein and as directed by the Engineer. Relocation of temporary traffic signals shall
be complete with all poles, signal units, wiring, conduits, power, and appurtenances.

2. Temporary Traffic Signal Controllers

The  Contractor  shall  furnish,  install  and  maintain  temporary  traffic  signal  controllers  and
associated  equipment  as  specified  herein  and  as  approved  by  the  Engineer.  Local
intersection control equipment shall perform all functions necessary for the control of traffic
signals  such  as  to  safely  assign  rights-of-way  to  vehicular  traffic.  Intersection  control
equipment  shall  be  uniform  throughout  the  Contract  unless  otherwise  approved  by  the
Engineer.

The Contractor shall include all conduit, wiring and appurtenances and all electric power to
all temporary traffic signal controllers.

Local control equipment shall include, but not by way of limitation, the following major
components:

Traffic signal controller

ii.

Local intersection controller

iii.

Local intersection controller cabinet;

iv.

Solid state load switches or electro-mechanical load switches (relays)

Intersection conflict monitor;

vi.

External flash device

vii.

Device so that when red is absent, the signal will automatically switch to flash red
(minor traffic flow) and amber (major traffic flow)

Descriptions for each of the major components above are provided herein. The Contractor
shall provide any additional equipment necessary to make the system perform in accordance
with good traffic engineering practices, and to the satisfaction of the Engineer.

3. Traffic Signal Controllers

All traffic signal controllers shall be pretimed solid state devices. The Contractor shall supply
all devices necessary to fully program the solid state as well as the source and object code
for  the  traffic  control  programs.  Timing  shall  be  digital  in  nature  and  based  on  a  50  hertz
supply frequency. Number and sequence of phases at each intersection shall be as required,
as  indicated  on  the  Contract  plans  or  by  the  traffic  patterns  and  traffic  volumes,  and  as
directed by the Engineer.

Controllers shall be capable of withstanding the local temperature and humidity conditions
and provide continuous, uninterrupted service under all conditions.

It shall be possible to change controller timing parameters manually from the front of the
controller cabinet. All controllers shall provide the following features:

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Signal  indication  sequence:  Vehicular  signal  indication  sequence  shall  be  green-
amber-red.  No  amber  indication  shall  appear  between  red  and  green  indications.
Capability shall be included to provide all-red clearance intervals for each phase.

ii.

Dials: Controllers shall contain a minimum of 4 timing dials.

iii.

Cycle length: Signals shall have a cycle length range of 0 seconds to 99.9 seconds,
adjustable at 5-second steps.

iv.

Number of phases: Capability to accommodate 4 separate phases.

Signal intervals: Number of intervals shall range from 1 to 16. Interval timing shall
range from 0 seconds to 99.9 seconds, adjustable in 0.1-second steps.

vi.

Manual control: Manual controls shall be provided to permit vehicular signals to switch
to any related phase, or to display red indication in all directions, or to switch from one
time plan to another. When red is absent, the signal shall switch to flash red (minor
traffic flow) and amber (major traffic flow).

vii.

Flashing mode: For late night operation, signals shall have the capability of operating
in a flashing mode whereby vehicular signals controlling the main road shall flash
showing amber indication, and vehicular signals controlling the cross road shall flash
showing red indication.

The Contractor shall bring electric power to the local controllers in accordance with the
ADWEA requirements.

4. Controller Cabinets

All local control equipment at a given intersection shall be mounted in a single waterproof
cabinet made of approved materials. All cabinets shall include a ventilation fan and filter. It
shall be possible to operate the controller in a manual mode without opening the large door
(e.g., via a "police panel"). All equipment necessary to properly mount the cabinets (including
mounting poles or foundations if required) and to install the local control equipment in the
cabinet shall be provided by the Contractor. An electric power outlet shall be provided in each
controller cabinet.

5. Load Switches

Signal light circuits shall be controlled by solid state load switches or electro-mechanical load
switches (relays). Each circuit shall have a minimum rating of 600 watts for tungsten lamp or
gas tubing transformer load at 240 volts, AC. Switches shall be capable of operating in all
local climatic conditions.

6. Intersection Conflict Monitor

An intersection conflict monitor shall be provided for each intersection which shall monitor
the output of the green load switches. In the event a conflict condition exists, the conflict
monitor shall cause the intersection to go to the emergency flash condition. Intersection shall
also go to the emergency flash condition under any of the following occurrences:

Absence of required red or amber signal

ii.

Absence of security program

iii.

Signals hanging indefinitely in one state

iv.

Processor fault condition

7. External Flash Units

Each local controller cabinet shall contain a solid state flasher unit to drive the signal lights
during periods of controller maintenance or controller malfunction. When operating, the
flasher shall flash all red or amber and red indications in designated directions at a rate of 60

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flashes per minute. It shall be possible to remove control of the signal lights from the local
controller and give control to the flasher unit in the following manner:

Manually changing position of a single switch

vi.

Action of a conflict monitor

vii.

Action of a watchdog timer, as applicable

8. Watchdog Timer

A watchdog timer shall be provided and installed, and shall be used with solid state based
controllers.  Purpose  of  this  timer  is  to  prohibit  faulty  controller  operation  from  causing  the
signal light indication to "hang" indefinitely in one state. When used, the controller shall reset
the timer periodically. If allowed to time out, the watchdog timer shall cause the signal lights
to be put in the flash mode. Watchdog timer may be either part of the hardware of the local
controller  or  an  external  device.  All  switches,  solid  state  components  and  other  ancillary
equipment necessary to provide the operation just described shall be provided and installed
by the Contractor.

9. Temporary Traffic Signal Controllers, Supplied by Owner

Owner  reserves  the  right  to  direct  the  Contractor  to  obtain  all  temporary  traffic  signal
controllers, except cables and/or wiring, from the Owners store yards. The Contractor shall
obtain the temporary traffic signal controllers, as directed by the Owner, from the designated
store yard. The Contractor shall load, transport, unload, and install all such temporary traffic
signal  controllers,  complete.  The  Contractor  shall  furnish  and  install  all  conduits,  cables
and/or  wiring  and  electric  power  to  all  temporary  traffic  signal  controllers  required  for  the
operation of all units as approved by the Engineer.

10. Relocate Temporary Traffic Signal Controllers

The Contractor shall relocate temporary traffic signal controllers as indicated on the Contract
plans, as specified herein and as directed by the Engineer. Relocation of temporary traffic
signal controllers shall be complete with all associated equipment and electric power to the
relocated controllers, wiring, conduits, and appurtenances.

l. Flaggers

Where directed by the Engineer, the Contractor shall provide and station competent flaggers whose
sole duties shall consist in directing the movement of pedestrians and traffic through or around the
works. Flaggers, flagging stations, equipment, and operations shall be consistent with the MUTCD
treatment of these topics and shall meet the requirements stated therein.

m. Temporary Utility Protection and Removal at Detour Roads

The Contractor shall furnish and install temporary concrete slab protection and/or temporary
concrete encased split PVC duct at detour road and construction equipment crossings of utilities as
indicated on the Contract plans or as directed by the Engineer. All such temporary utility and service
protection shall be as detailed on the Contract plans and as specified in the applicable sections of
Chapter 11, Utilities.

The Contractor shall be responsible for all costs, expenses and other expenditures required repairing
or  restoring  any  damaged  utility,  service  property,  and/or  structure.  In  the  event  the  concerned
governing  agency  or  owner  of  such  damaged  utility,  service,  property,  and/or  structure  elects  to
make necessary repairs or restoration with their own forces or designated Contractor, the Contractor
shall bear all costs, expenses or other expenditures involved or incurred by said governing agency
or  owner.  The  Contractor  shall  directly  resolve  with  the  concerned  agency,  Owner,  or  owner  the
extent of repairs, costs, expenses, or other expenditures as required.

Unless otherwise directed by the governing agency or owner of the utility and/or service that the
temporary protection shall remain in place, the Contractor shall remove and dispose of all temporary

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utility protection slabs and split ducts as required per the relevant sections in Chapter 11, Utilities,
as soon as the temporary crossing is removed from service.

n. Temporary Electrical Work

All temporary electrical work shall be protected by ground fault circuit Interrupters (GFCI) and shall
be in accordance with the AGC Manual of Accident Prevention in Construction.

All connections and installation shall be in compliance with ADWEA Regulations.

If portable generators are used to supply temporary power needs, the generators shall be grounded,
inspected and documented on a regular basis for proper operation.

All temporary electrical work shall be inspected on a weekly basis and audited by a certified
electrician and results documented.

o. Accommodation of Existing Conditions

1. Existing Informational, Guide, Street Name and Numbering Signs

In  locations  where  existing  informational,  guide  street  name  and  numbering  signs  conflict
with  proposed  improvements,  the  Contractor  shall  adopt  the  following  procedure  for  their
removal, storage and reinstatement.

The Contractor shall obtain the applicable forms from the appropriate authority to
apply for permission to remove the signs.

ii.

Only after permission has been granted, the Contractor shall proceed with the removal
of the sign.

iii.

It is the Contractor

’s responsibility to remove, store and reinstate the signs upon

completion of the works, to the satisfaction and approval of the relevant authority and
the Engineer. The Contractor shall be responsible for the safety of the sign and shall
replace and/or repair signs damaged by him or through his negligence.

iv.

If  the  sign  is  not  to  be  reinstated  in  the  same  location,  the  foundation  shall  be
demolished  or  removed  along  with  all  associated  cabling,  conduit,  pull  boxes  and
other  appurtenances  with  the  resulting  excavations  being  properly  backfilled  in
accordance with the specifications.

When appropriate, the Contractor shall have any new locations approved by the
relevant authority before commencing the reinstatement works.

vi.

The Contractor shall construct new foundations, all necessary ducting and pull boxes,
reinstall the previously removed signs, and if applicable, reconnect the sign to a
suitable power source.

vii.

The Contractor shall obtain a clearance certificate from the relevant authority to record
that the signs have been reinstated to their satisfaction.

2. Existing Roadside Structures and Street Furniture

In locations where existing roadside structures and street furniture (includes such items as
bus  stop  shelters,  fountains,  shade  structures,  play  equipment,  benches  and  other
miscellaneous.  roadside  items  as  identified  on  the  Contract  plans  or  as  directed  by  the
Engineer) will conflict with roadway improvements, the Contractor shall advise the relevant
authority  and  then  proceed  to  carefully  remove  those  structures  when  required  for
construction.  The  removed  structures  shall  be  stored  in  a  manner  and  at  a  location
acceptable to the relevant authority while construction proceeds.

After removal of the structures, their foundations shall be demolished (or removed if such can
be suitably done) with the ensuing excavations being properly backfilled.

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In coordination with the relevant authority and with the approval of the Engineer, locations for
the reinstatement of the removed structures compatible with roadway improvements shall be
determined. The Contractor shall then construct new foundations and/or reinstate removed
foundations and reinstall the previously removed structures.

All work related to the removal, storage and reinstatement of the existing structures shall be
done in accordance with the requirements of the relevant authority. The Contractor shall be
responsible for the safety of the structures and shall replace and/or repair any damage
caused by him or through his negligence.

3. Removal, Protection and Transportation of Trees, Palms and Shrubs for

Transplanting

Where directed by the Engineer the Contractor shall carefully excavate and protect all
existing trees, palms and shrubs identified for transplanting on the Contract plans or by the
Engineer and transport to other locations specified by the Engineer, and replanted. All
removal, transporting and replanting shall meet the applicable requirements of Chapter 13,
Landscaping and Irrigation.

p. Rumble Strips

The  Contractor  shall  be  responsible  for  furnishing;  installing  and  maintaining  all  rumble  strips  on
approaching  roadways,  detour  pavement,  other  temporary  roadways  and  on  service  roads  as
directed  by  the  Engineer.  Maintenance  shall  include  all  labour,  materials,  tools,  equipment  and
appurtenances to remove deteriorated rumble strips and to furnish and install replacement or new
rumble strips as approved by the Engineer. The Contractor shall remove all rumble strips from the
site and disposed of as approved by the Engineer when no longer required.

Material, execution, layout, machinery and equipment utilised in application of rumble strips for the
works as described above shall conform to Section 8.4.5 of Chapter 8, Traffic Marking and Signs.
Width, colour, length, and location of rumble strips shall be indicated on the Contract plans for the
intended use on the detour pavement, other temporary roadways and on service roads as directed
by the Engineer.

Rumble strips shall be 6 mm thick and 200 mm wide. Rumble strips material shall be applied in 2
equal layers, with glass beads applied uniformly on the top layer only.

q. Temporary Pedestrian Access and Safety Items

The Contractor shall be responsible for furnishing, installing and maintaining all temporary pedestrian
access  and  safety  items  in  areas  as  determined  by  the  Engineer,  where  construction  operations
result in a condition that is considered to be hazardous to the general public, to maintain pedestrian
access or to separate the work area from pedestrian areas. Location and extent of the temporary
access and safety items shall be as directed and approved by the Engineer. Temporary pedestrian
access and safety items shall remain the property of the Contractor and shall be removed from the
site  of  the  works  as  approved  by  the  Engineer  when  no  longer  required.  Temporary  pedestrian
access and safety items may be of the following:

Temporary sight screen

Temporary pedestrian wire fence

Temporary pedestrian bridges

Temporary sidewalks

1. Temporary Sight Screen

In areas as determined by the Engineer, where sensitive construction operations are to be
screened from the general public, the Contractor shall construct temporary sight screen
fencing to separate the work area from public view. Location and extent of the fencing shall
be as directed and approved by the Engineer.

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Fencing shall be solid and continuous, not less than 3.0 m in height. Screen shall be
constructed of painted wood or metal and shall be neat in appearance. Details of construction
shall be as proposed by the Contractor and approved by the Engineer. Fencing shall be of
substantial construction such that it will not be damaged or displaced by wind or other normal
natural or manmade forces. Fence shall be maintained by the Contractor until such sensitive
operations are complete as approved by the Engineer.

Maintenance and upkeep of the screens shall be the responsibility of the Contractor
throughout the duration of their use.

2. Decorative Painting on Temporary Sight Screen

If directed, the Contractor shall apply a decorative painted finish to the temporary sight
screens used on the project. Decorative painted finish shall be applied only to the surface
exposed to the general public view.

Form of the decoration shall be a multi-coloured, maximum 3 colours, geometric or free
flowing pattern, with simple stencilled details such as a tree, Municipality logo or similar item,
at an interval of approximately 20 m.

3. Temporary Pedestrian Wire Fence

Where pedestrians must be separated from the work site, or directed through work zones
and detour traffic, the Contractor shall install temporary pedestrian wire fences as directed
or approved by the Engineer. Temporary pedestrian wire fences shall meet the requirements
of Section 7.7 of Chapter 7, Incidental Construction.

4. Temporary Pedestrian Bridges

In areas as determined by the Engineer, the Contractor shall construct temporary pedestrian
bridges to maintain the access. These areas include, but not by way of limitation:

Locations where trench excavations obstruction pedestrian access to buildings

ii.

Bridges over the proposed detour routes and work areas

Bridge shall be solid and continuous, not less than 1.5 m in width, with rigid hand rails. Bridge
shall be constructed of wood and/or metal and shall be neat in appearance. Details of
construction and the installation locations shall be proposed by the contactor and approved
by the Engineer.

The Contractor shall maintain the bridge until the trench excavations are backfilled and public
right of way is no longer obstructed as directed and approved by the Engineer.

Bridges shall be multi-span, providing a clear span of 40 m to 45 m, and provide a minimum
vertical clearance of 6.5 m. Walkway width shall be in the range 1.8 m to 2.0 m.

Bridge shall be of modular steel construction with aluminium or other approval deck, and shall
have wooden access stair treads. All walking surfaces shall be non-slip. Actual span
configuration of each bridge shall be as determined by the site conditions. All support towers
and stairs shall be adequately protected from impact by passing traffic.

These bridges shall not be used by the Contractor for any construction activities.

The Contractor shall submit fully detailed shop drawings of all proposed temporary pedestrian
bridges for the Engineer’s review and approval. Bridges shall be fully compliant with the
design requirements of the Abu Dhabi Road Structures Design Manual (AD-D-06). Details
provided shall include the proposed foundation details.

5. Temporary Sidewalk

Temporary sidewalk shall be installed at the locations as shown on the Contractor’s approved
detour plans, or as directed by the Engineer. Construction shall meet the applicable
installation requirements of Section 7.6.3 of Chapter 7, Incidental construction, except as

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noted herein. Temporary sidewalks shall meet the general requirements of Article 7.6.3.1 for
slopes and grades.

Prior to placement of pavement for temporary sidewalks, the Contractor shall prepare a
foundation in accordance with Article 7.6.3.2 of Chapter 7, Incidental construction, or as
approved by the Engineer.

On the prepared subgrade, the Contractor shall place and compact either 5 cm of asphaltic
concrete base course as specified in Section 3.3 of Chapter 3, Pavement, or Class C20/20
concrete  as  specified  in  Section  7.6.4  of  Chapter  7,  Incidental  construction,  for  use  as
temporary sidewalk.  Installation of asphaltic concrete temporary sidewalks shall meet the
applicable installation requirements of Section 3.3.3, with the provision that hand placement
and  compaction  may  be  used  for  areas  inaccessible  to  the  approved  asphalt  paving
equipment, if approved by the Engineer. Installation of concrete temporary sidewalks shall
meet the requirements of Section 7.6.4.

When no longer required, the Contractor shall remove all construction of temporary sidewalks
and restore the site as required by applicable Articles of the Department of Transport
Conditions of Contract and Schedule of Further Requirements, as indicated on the Contract
plans and as directed by the Engineer.

All materials resulting from removal of temporary sidewalk shall be considered the
Contractor’s materials to be removed from site and/or disposed of in accordance with Section
2.3 of Chapter 2, Earthworks.

r. Detour Shop Drawings

The  Contractor  shall  follow  maintenance  of  traffic  (detour  plans)  plans  included  in  the  Contract,
unless  otherwise  directed  by  the  Engineer,  and  shall  obtain  all  necessary  approvals  from  the
appropriate local agencies. If modifications are proposed by the Contractor to the maintenance of
traffic Contract plans, the Engineer shall have the right to reject any proposed modifications that are
not acceptable to the Owner or do not comply with the requirements of the Contract documents.

The Contractor shall submit shop drawings complete with all details and description of construction
staging and temporary construction for the maintenance of traffic as indicated on the Contract plans
and as necessary for the proposed construction sequence, and obtain the approval of the Engineer
prior to reviewing with and obtaining local agency and authorities approvals.

Vehicular and pedestrian access to facilities within the local area affected by the construction works
must be maintained at all times.

The Contractor shall construct detours and install temporary traffic control devices in accordance
with the approved shop drawings, standard specifications, and the Contract plans. The Contractor
shall be responsible for coordinating the relocation and removal of all greenery which obstructs the
construction of the detour route. Similarly, it shall be the Contractor

’s sole responsibility to obtain the

necessary clearances and approvals for detours which conflict with existing or proposed utility
installations.

The Contractor shall consider the use of additional sub-stage detours to facilitate any utility
installations in service reservation crossings that pass under existing roads or detour routes. All such
utility installations shall be fully reviewed with the Engineer prior to commencing each detour phase.

1. Criteria for Revising Detour Shop Drawings

Flow of traffic shall be maintained at all times. Traffic will not be permitted to pass under
bridges which are under construction, unless adequate protective cover is provided.

Temporary roadway cross sections and pavement structure sections shall be as detailed in
the Contract plans.

Temporary roadway widths for main road detours shall be a minimum of 2 lanes in each
direction, each lane 3.5 m wide, plus a paved shy distance on the inside and outside edge of

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pavement as detailed on the Contract plans unless specifically directed or approved
otherwise by the Engineer.

All construction staging or substaging shall be approved by the Engineer in writing prior to
commencing construction. After approval by the Engineer, the Contractor shall obtain
approvals in writing from the concerned authorities.

The Contractor shall provide and maintain vehicle and pedestrian access to adjacent
buildings, commercial establishments, facilities, or areas during all work. Such access and
its maintenance shall be subject to approval by the Engineer.

Single lane traffic may be proposed by the Contractor when no other means of detouring is
available and when approved by the Engineer.

In general, one lane of traffic shall be maintained on the service roads and detour roads on
isolated sections and the lengths of isolated approved single lanes (along a multi-lane road)
shall not exceed 500 m and,  in the event work is proceeding at more than one place, the
distance  between  lengths  of  single  lanes  shall  be  no  less  than  500  m  unless  otherwise
approved by the Engineer.

The Contractor shall propose his detour to offer the least possible obstruction, inconvenience
and delay to public traffic, and shall be responsible for providing adequate control of public
traffic using these single lane lengths as previously specified.

Existing roadways shall be used for detours whenever possible.

Works shall be scheduled in accordance with the Contract staging plans as approved by the
Engineer.

1.16

Temporary Works

This section describes the design, construction, maintenance, and removal of temporary works,
which are generally designed and employed by the Contractor to execute a work. Failure of such
temporary works can negatively affect project work and endanger adjacent facilities, property, or the
public. Temporary works for structure include falsework, forms, cofferdams, shoring, water control
systems, and temporary bridges.

Safety and adequacy of all temporary works shall be solely the responsibility of the Contractor.

Forms are enclosures or panels that, containing concrete, resist contrary forces due to their weight,
rate of/ and placement. Forms may themselves reside on top of falsework for additional support.
Falsework is any temporary structure that supports structural elements, such as concrete slabs,
girders, steel, and masonry, during their construction. Falsework is no longer needed after a structure
is complete and can support itself including surcharge load.

1.16.1

Working Drawings for Temporary Works

The Contractor shall provide working drawings with design calculations and supporting data and
assumptions in sufficient detail to permit a structural review of the proposed design of a temporary
work. The Contractor shall submit working drawings and design calculations sufficiently in advance
of proposed use, typically at least 14 days before the Engineer's approval is required, to allow time
for review, possible revision, and approval without delaying work.

The Contractor shall design and show the details for constructing the temporary works including
falsework that provides the necessary rigidity and supports the loads to be imposed on them. The
Contractor shall engage the services of a Specialist Engineer to design, sign, and seal the drawings.
Design calculations shall show the stresses and deflections in load supporting members.

The Contractor shall submit three sets of working drawings and one set of design calculations for
approval.

Abu Dhabi, United Arab Emirates. STANDARD CONSTRUCTION SPECIFICATIONS (PART 1 - ROADS, Second Edition 2020) - page 14