Traffic Signs for Use at Road Works
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Transcript Traffic Signs for Use at Road Works
Traffic Signs for Use at
Road Works
Reference:
Code of Practice for the Lighting,
Signing and Guarding of Roadworks,
Highways department, Second Issue
October 1990
Warning, Regulatory &
Informatory Signs
Details of sign face to comply with Transport
Department (Road Safety and Standards
Division)
Reflective material to BS 873 or
internally/externally illuminated to the
satisfaction of Director’s representative of
Highways
Temporary emergency signs (for use less
than 24 hours) at least 300 mm above the
ground.
Traffic Control Equipment
Minimum
carriageway width for two way
traffic is 5.5 m
Maximum carriageway width 3.7 m and
minimum 3 m for alternate one way
working with traffic light signals or
“Stop/Go” signs
Traffic Control Equipment
a)
b)
c)
d)
Portable traffic light (Approved by the
Transport Department) signals are preferred
where:
length of control over 30 m
length of control < 30 m and view of
oncoming traffic is obscured
during hours of darkness
If control length < 15 m, one sign is required
and located centrally
Cones
Boundaries of roadworks to be clearly
delineated by cones
Cones to comply with BS 873
White portions to be reflectorised
Red portions either reflectorised or in
florescent finish
Traffic cylinders fixed into metal bases may
be used or in combination with cones on high
speed roads
Cones
Spacing:
3m
- low speed roads
9m
- normal spacing
18 m - for long stretches of dual
carriageway high speed roads
2m
- for normal lead in tapers
1m
- 45 degrees tapers where traffic
control is used or at end tapers
Barriers
Portable, stable under adverse weather
conditions and appear substantial, where
necessary to protect pedestrians and the
road work themselves
To be visible by day and night, preferably
carried with traffic signs or lanterns
Wooden or tubular steel poles must not be
used as horizontal barriers
Barriers
Steel
barriers should not be used on
high speed roads
Excavations on or near footways must
be guarded with secure barriers to give
warning to blind persons
Road hazard warning
lanterns
To light up obstructions during hours of
darkness
Lanterns to comply with BS 3143 Parts 1-4
Yellow in color with amber lenses
May show a continuous, intermittent or
revolving light
Flashing lantern flash or revolve 90 - 150
times per minute
Road hazard warning
lanterns
Fitted
with a supplementary reflector at
least 50 cm2 in area
Mounted maximum 1.2 m above road
level
Kerosene burning lanterns are not
recommended
Low intensity battery operated lanterns
are generally preferred
Road hazard warning
lanterns
Lanterns
should be placed at regular
intervals along the line of the
obstructions.
To be placed midway between
successive traffic cones: 3, 9 or 18 m in
conjunction traffic cone spacing
Flashing lanterns at lead-in tapers to be
placed in 8 m spacing
Roadmarkings
Self-adhesive
materials used
temporarily to delineate the carriage
way edge or to divide the carriageway
into traffic lanes
To be removed as soon as it has served
the purpose
Existing markings, if needed, should be
removed instead of being covered.
Roadmarkings
Or, they should be masked with proprietary
black tape and not be black painted.
Opposing streams of traffic to be separated
by providing a temporary 100 mm wide
reflectorised warning line comprising 2 m
gaps for speed limit not grater than 70 km/h
Line comprising 6 m marks and 3 m gaps for
speed limit greater than 70 km/h
Roadmarkings
A “when
Red Light Shows Wait here”
sign or a transverse white reflectorised
“Stop” line to show where a driver
should stop
Work on Footways and
Verges
A minimum width 1.5 m to be maintained for
pedestrians
2.5 m footway width in high density
residential or commercial areas
Where it is not practical to provide the
minimum widths, Director of Highways o his
representative and the Police should be
consulted if the adjacent carriageway is to be
used for the roadworks.
Work on Footways and
Verges
Spoil, plants and materials to be protected
adequately by continuous barriers and not
obstruct any sight lines at the road junction in
particular.
Warning signs on carriageway are not
required if the guarding is further than :
0.5 m from the edge of the carriageway for
ordinary roads;
1.2 m from the edge of the carriageway for
high speed roads, and
does not force pedestrians onto the
carriageway.
General Road Works Signs
Traffic
Sign numbers and Drawing
Number series CT174/51-1 to CT
174/51-5 are obtainable from the Road
Safety and Standards Division of the
Transport Department
Procedures during Road
Works
Place
traffic signs, cones and barriers
facing oncoming traffic, starting from the
‘Road Works’ sign, progressing in
sequence moving back towards the site
Tools and materials not to be left
outside the area
Site traffic and equipment to be parked
within the works area
Procedures during Road
Works
Site traffic restricted to ‘off peak’ periods
Site to be kept tidy, adjacent carriageway and
footpaths kept free of loose stones, debris
Provide and maintain in good conditions
temporary footways for pedestrians
If safety clearance between the works &
traffiked carriageway is not possible, methods
of reducing traffic speed should be employed
Minor works & Minor Roads
Minor Works
Works completed within the day time of
the day
Minor Roads
(e.g. local distributor road, speed limit ,
50 km/h, infrequent bus-serviced and
low pedestrian flows)
Minor works & Minor Roads
Both minor works and minor roads may
require fewer signs and need not be lit
Moving works (e.g. gully emptying, lighting
maintenance) to be carried out during periods
of low risk and inconvenience
Full lane closures for any road works next to
central reservation except an operating
vehicle is equipped with a multiple sequence
warning sign (type and location to be
approved by Transport Department and
Director of Highways)
Expressways
Separate
procedures and requirements
for works on expressways
Engineer Representative must be
consulted prior to any commencement
of the work
Arrangement of Signs at
Road Works
Signs to be placed on the verge wherever
possible
Prior to heavy rainstorm or typhoon, portable
signs to be secured or adequately weighted
at the bottom
Where works impose a temporary height
restriction less than 5 m, the warning of
“Height Restriction” sign to be attached to the
structure(s) built over the carriageway
Arrangement of Signs at
Road Works
Height
restriction less than 4.7 m to be
avoided
Height gauge to warn drivers should be
provided
Siting Distance and Size of
Signs
Refer
to the recommendations and
tables stipulated in the Code of Practice
Cones & Tapers
A very important feature of all road works
When traffic control is provided, a much
shorter approach taper is required
The line of cones at 45 to the line of the road
placed at 1 m spacing ( for both approach
and exit tapers)
Road hazard warning lanterns showing
intermittent light to be placed between each
successive cone at 1 m spacing( for both
approach and exit tapers)
Check list for designing
roadworks layout
Operate
traffic control if the road width
is restricted to 5.5 m or less
Check signing, lighting and guarding
works comply with the Code
Consult the appropriate authorities
before starting the work
Erect the signs before commencing
work and check the layout
Check list for designing
roadworks layout
Ensure
all signs are regularly
maintained
Keep the site tidy
Remove the signs after the road works
are completed