Post on 25-Dec-2015
transcript
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 mMaximum 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 Portable traffic light (Approved by the
Transport Department) signals are preferred where:
a) length of control over 30 mb) length of control < 30 m and view of
oncoming traffic is obscuredc) during hours of darknessd) 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:
3 m - low speed roads
9 m - normal spacing
18 m - for long stretches of dual carriageway high speed roads
2 m - for normal lead in tapers
1 m - 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
BarriersSteel barriers should not be used on
high speed roadsExcavations 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 lanternsFitted with a supplementary reflector at
least 50 cm2 in areaMounted maximum 1.2 m above road
levelKerosene burning lanterns are not
recommendedLow intensity battery operated lanterns
are generally preferred
Road hazard warning lanternsLanterns 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
RoadmarkingsA “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 WorksWorks 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 expresswaysEngineer 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 WorksHeight restriction less than 4.7 m to be
avoidedHeight 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 lessCheck signing, lighting and guarding
works comply with the CodeConsult the appropriate authorities
before starting the workErect the signs before commencing
work and check the layout
Check list for designing roadworks layoutEnsure all signs are regularly
maintainedKeep the site tidyRemove the signs after the road works
are completed