Edition: Februray 2011 CSTR: Part D028 Design – Signs, Barriers and Pavement Marking
PART D028
DESIGN – ROAD SIGNS, BARRIERS AND PAVEMENT MARKING
CONTENTS
1. General
2. References
3. Design Requirements - Signs
4. Design Requirements - Barriers
5. Design Requirements – Pavement Marking
6. Hold Points
7. Records
1. GENERAL
This Part specifies the requirements for the design of the pavement marking of roadworks, permanent Road Signs, permanent traffic barriers and other Road Furniture. It does not cover barriers that are an integral part of a structure (refer Part D035 “Design – Structural”).
"Road Sign" includes route numbering, road naming, destinations, direction, regulatory and warning signing, hazard markers and sight boards, guideposts and kilometre posts and other devices for the purpose of regulating, warning, and guiding traffic.
“V/CMS” means a Variable Message Sign and / or Changeable Message Sign.
2. REFERENCES
Unless specified otherwise, all design shall be undertaken in accordance with the following:
Signs and Pavement Marking
1. DPTI: "The Legal and Technical Responsibilities for Traffic Control Devices"
- AS 1428 “Design for Access and Mobility”
3. DPTI Road Sign Guidelines (Guide to Visitor and Services Road Signs in SA)
4. DPTI: "Pavement Marking Manual"
5. DPTI: "Traffic Management Operational Instructions"
- AS1742.1 to 15: "Manual of Uniform Traffic Control Devices"
- AS1743: "Road Signs – Specifications"
- DPTI: "Signs Index Database”
- Austroads: “Guide to Traffic Engineering Practice Parts1- 15"
- DPTI Drawing TES12186 “Positioning and Attachment of Stiffener Rails”
Barriers
- DPTI: Road Design Standards and Guidelines (Refer: http://www.dpti.sa.gov.au/standards).
- AS3845 "Road Safety Barriers Systems".
- Austroads: “Guide to Road Design Part 6: Roadside Design, Safety and Barriers”.
- Manufacturer’s Instructions.
DPTI publications / database for signs and pavement marking are available from: http://www.dpti.sa.gov.au/standards/tass.
3. DESIGN REQUIREMENTS- SIGNS
3.1 General
The Contractor shall design assets for the following minimum design life:
ELEMENT / DESIGN LIFE (YEARS)Major sign structures, including cantilever signs, gantries and supports for V/CMS / 100
Other sign support structures and other roadside furniture / 40
Sign faces / 10
Signs and any other Road Furniture must not be placed within the Shoulder. Road Verges must be kept as free of furniture as practicable.
The proposal to place any Road Furniture within the Verge or the design clear zone shall constitute a HOLD POINT. Any non-frangible Road Furniture which has been approved to be placed within the design clear zone must be protected using a safety barrier.
The location of the Direction Signs shall comply with the AS1742 Part 15 “Direction signs, information signs and route numbering”. The Contractor is responsible for determining the type and location of all signs. Drawings shall clearly show dimensions necessary to locate the signs and the type of supports to be used.
The Principal will provide authorised signface drawings (Specific Road Sign Specifications for South Australia) to the Contractor regarding route numbering, road names, destinations, and Tourist and Service signs.
The Contractor shall design and provide drawings (Specific Road Sign Specifications for South Australia) detailing route numbering, road names, destinations, and Tourist and Service signs. Provision of these drawings shall constitute a HOLD POINT.
3.2 Major Sign Structures
Major sign structures, including cantilever signs, gantries and supports for V/CMS, shall comply with the requirements of PartD035 “Design – Structural” and Part 430 “Fabrication and Erection of Structural Steelwork”. The protective treatment shall comply with Part435 "Protective Treatment of Structural Steelwork".
The design shall comply with the following:
(a) fabrication of sign fasteners shall be in accordance with DPTI Drawing No.TES12186;
(b) fixings of signs to gantry structure shall be the same in principle as shown on DPTI Drawing No.12894, sheet87;
(c) unless specified otherwise, the geometric shape and appearance of gantries (portal and cantilever types) shall match gantries on the adjacent road network;
(d) the final coating colour of all exposed steel surfaces and the back of the sign plate shall be G61 to AS2700 "Colour Standards for General Purpose";
(e) gantries shall be rigid type; and
(f) gantries shall be protected from traffic impact.
The gantry structures located within clearzone shall be protected with a traffic barrier system complying with Clause4 “Barriers”.
The minimum nearside and offside distance to the edge of the lane and the barrier shall comply with AS3845 and Austroads IR-97/05. The barrier shall have sufficient clearance to the gantry to allow for barrier deflection and provide access for maintenance. Refer to Clause 261.6 “Site Maintenance Access” for further access requirements for structures supporting Equipment for Intelligent Transport Systems (ITS).
3.3 Placement of Variable and Changeable Message Signs
3.3.1 General
V/CMS shall:
(a) unless impracticable, be positioned overhead rather than being placed in a Verge;
(b) provide sufficient vertical and lateral clearances from the running lanes and not create a hazard to road users;
(c) not be permitted within an interchange area where merging, frequent braking or weaving movements are common; and
(d) be placed in locations that allow adequate reading time for all road users and adequate time and travel distance for the road user to act on the message and where this will not adversely affect the driving task.
3.3.2 Lateral Placement of V/CMS
The minimum lateral clear zone widths for V/CMS supports shall comply with Table 3.3.2
Table 3.3.2Minimum Clear Zone Widths for VMS/CMS Supports
Speed (km/h) / Clear Zone (m)
60 / 4
70 / 5.5
80 / 7
90 / 8
100 / 9
110 / 9
120 / 9
Where guardrail or a concrete barrier has been installed, the supports of the V/CMS shall be at least 1.0 m behind the face of a guardrail or concrete barrier.
The display or face of an overhead V/CMS shall not be further than 5.0 m from the closest running lane.
Where the ground clearance of the sign face of a roadside V/CMS is less than 5.5m, the sign face shall be located outside the design clear zone.
The minimum clearance from the edge of a roadside V/CMS to the outer edge of the shoulder or guidepost shall comply with the following
Rural areas: 2.0m
Urban areas: 1.5 m.
3.3.3 Vertical Clearance of V/CMS
The minimum vertical clearance from the ground or road surface to any part of a sign or structure shall comply with the following:
Overhead V/CMS
Over a running lane - desirable: 6.0m
Over a running lane - absolute minimum: 5.5m
Not directly over a running lane: 5.0m
Roadside V/CMS
Urban environment with likely pedestrian movements: 2.0m
Above a defined pathway: 2.5m
Rural areas in areas not subject to pedestrian movements: 1.5m
3.3.4 Longitudinal Placements of V/CMS
All V/CMS shall be positioned to achieve the following:
(a) be clearly legible to all road users;
(b) not compete with other traffic signs, traffic control devices or roadside furniture; and
(c) not be placed in locations where the V/CMS will be partially hidden by any roadside objects, furniture or vegetation.
The distance between any V/CMS and a hazard, decision point, intersection, or any other piece of roadside furniture that may take the road users attention shall be:
Business and residential districts: 30-100 m
60 – 70 km/h 80-120 m
80 – 90 km/h 120-180 m
100 – 110 km/h 180-250 m
The minimum distance between any V/CMS and another road sign shall be:
Business and residential districts: 30 m
60 – 70 km/h 20 m
80 – 90 km/h 60 m
100 – 110 km/h 70 m
4. DESIGN REQUIREMENTS - BARRIERS
4.1 General
All traffic barrier systems, including barrier terminals, shall comply with AS3845 and the following as appropriate:
(a) Part 242 “Supply and Installation of Steel Beam Road Safety Barrier Systems”;
(b) Part 243 “Supply and Installation of Wire Rope Road Safety Barrier Systems”; and
(c) Part 244 “Construction of Concrete Safety Barrier Systems”.
The type of barrier(s) and associated energy absorbing system(s) shall be subject to the prior approval of the Principal. For efficiency of maintenance, the Principal requires that the number of types of barriers and energy absorbing systems on the road network is kept to a minimum and reserves the right to withhold approval of any barrier type at its absolute discretion.
4.2 Steel Beam Guard Fence
Steel beam guard fence, including the end terminals and the steel beam guard fence transition at connections to rigid barriers, shall be provided in accordance with the relevant DPTI Standard Drawings.
4.3 Wire Rope Safety Barriers
Wire rope safety barrier systems shall be 4 rope systems, designed in accordance with the manufacturer’s requirements and shall comply with the requirements of the DPTI Road Design Standards and Guidelines.
The drawings shall clearly show the allowable deflection and the relevant test level condition (TL 3 or TL 4).
4.4 Terminals for Rigid Barriers
Crashworthy end treatments must be provided on both the approach and departure ends of barriers that terminate within the clear zone. Energy absorbing systems shall comply with Austroads: "Roadside Safety Guide".
4.5 Traffic Barriers Foundations
The drawings shall clearly show any non-standard traffic barriers foundations.
5. DESIGN REQUIREMENTS – PAVEMENT MARKING
The design shall comply with the DPTI: Pavement Marking Manual.
6. HOLD POINTS
The following is a summary of Hold Points referenced in this Part:
CLAUSE REF. / HOLD POINT / RESPONSE TIME3 / Proposal to place Roadside Furniture within the verge of Design Clear Zone. / 5Working Days
7. RECORDS
The following records shall be provided to the Principal:
Drawings
The drawings described in the DPTI: Road Design Standards and Guidelines
As constructed drawings
Details and Maintenance Manuals of any Energy Absorbing System.
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