Edition: February 2011CSTR: Part D021 Design Road Geometry

Edition: February 2011CSTR: Part D021 Design – Road Geometry

PART D021

DESIGN ROADS

CONTENTS[D1]

1. General
2. References
3. Design Requirements
4. Pedestrian Facilities
5. Cycling Facilities
6. Public Transport Facilities
7. Property Accommodation
8. Rail requirements
9. Future Expansion and Extension Considerations
10. Records

1.GENERAL

This Part specifies the requirements for the geometric design of roads, pedestrian facilities and cycle facilities.

2.REFERENCES

Unless specified otherwise, all design shall be undertaken in accordance with the following:

1.DPTI: Road Design Standards and Guidelines (Refer:

2.DPTI: Pavement Marking Manual (Refer

3.Austroads: Guide to Traffic Management

4.Austroads: Guide to Road Design

5.AS1428 "Design for Access and Mobility".

6.DPTI Guidelines for Disability Access in the Pedestrian Environment, (Refer:

7.Austroads: Design Vehicles and Turning Path Templates

3.DESIGN REQUIREMENTS[RD2]

3.1Design Environment

The Works shall be deemed to be located in anurban/ruralenvironment.

3.2Traffic Volumes

Or refer to an appendix in lieu of the above table.

3.3Traffic Volume Lane Distribution

Insert any contract specific requirements here

eg

(a)provision for bus movements including longer buses and/or movement to and from bus bays;

(b)the level of access for restricted access vehicles such as the longer articulated vehicles like BDoubles/Triples;

(c)special provision for turning vehicles stating the location and requirements, or specific local traffic management issues which might preclude access to certain areas;

(d)special or additional lane width or clearance requirements, e.g. for local streets.

3.4Design Speed

eg

The design speed of loop ramps associated with the Northern Connector interchange may be reduced in accordance with Austroads Guide to Road Design Part 4C Interchanges, clause 6. Adoption of lower design speeds for interchange ramps shall incorporate adequate speed change arrangements to provide for transitions from highway speeds to ramp speeds.

3.5Geometric Design

South Road Superway Main Alignment

The South Road Superway Main Alignment shall provide a motorway standard roadway from the Elevated Roadway to Regency Road shall provide for the specified design vehicle, capacity and connectivity.

Median openings on the at-grade section of South Road Superway Main Alignment between Aruma Street and Regency Road shall all be closed to maintain a free flow non-stop corridor

South Road At-Grade

The South Road At-Grade shall provide to provide a local access roadway for local or regional access under and/or adjacent to the Elevated Roadway for the specified design vehicle, capacity and connectivity.

Intersections with Council Maintained Roads

Intersections shall be provided with the following features and connectivity:

(a)Wing street – provide east west connectivity, and all movements from both the one way southbound local access road from Salisbury Highway and two way local access road from South Terrace;

(b)York Street – a new T intersection to provide for all movements is desirable;

(c)Leed Street – a new T intersection to provide for all movements except left-out is desirable;

(d)South Terrace - provide a signalised intersection to provide for all movements except for right-turn in from South Road At-Grade. Signals to be coordinated with the Wingfield railway crossing;

The design shall comply with the minimum clearance/cover required by the owners of all overhead and/or underground utility services affected by the Works.

3.6Design Level of Service

eg

Level of Service assessment shall be undertaken on the roadway to determine the future congestion of the roadway in accordance with Austroads Road Design Guide, Guide to Traffic Management Part 2.

Level of Service and traffic modelling assessments shall be completed for all intersections to determine the future congestion and performance of intersections in accordance with Austroads Road Design Guide, Guide to Traffic Management Part 3.

The minimum Design Level of Service is detailed in the table below.

The Contractor shall demonstrate the Level of Service that can be achieved for all roadways and intersections and demonstrate measures to further maximise Level of Service, such as ramp metering, ITS technology.

Where the design level of service specified cannot be achieved on all intersection movements within the road reserve and land and property acquisition provided the Contractor shall:

(a)maximise the intersection design within the existing road reserve and land acquisition boundary;

(b)maximise the level of service of the major traffic movements;

(c)demonstrate the average level of service provided at the intersection; and

(d)demonstrate measures to further maximise Level of Service, such as ramp metering, ITS technology.

3.7Sight Distance

(a)any height controls that may affect sight distance at particular locations:

3.8Vertical Clearances To Bridges/Structures

(a)minimum design clearances for bridges over certain road classes;

(b)design clearances required for navigable waterways;

(c)design clearances required for tramway routes:

3.9Design Vehicle

The design of all roads shall allow for the design vehicle, including accommodation of vehicle swept paths, for all through lanes, turning and deceleration lanes and intersections.

The free flow carriageways shall be designed in accordance with Level 3 access (i.e. B-Triple and A-Double (Double Road Train)) requirements of the National Transport Council Performance Based Standards Scheme Network Classification Guidelines.

The design shall make allowance for over-dimensional / over-mass vehicles as per DPTI Over Dimensional Route Network as detailed in Appendix D021.3 DPTI Heavy Vehicle Access Framework

Design vehicles shall be as shown in the table below:

All existing road access, including access for over dimensional vehicles to properties along the South Road Corridor shall be maintained. Any alterations to current access arrangement are to be approved by the Principal.

The Contractor shall provide any additional drawings or modelling to demonstrate the road design can accommodate the design vehicle.

The A-Double, B-Double and Semi Trailer (heavy articulated) design vehicle shall be in accordance with DPTI heavy vehicle access framework Appendix D021.3.

The B-Triple design vehicle shall be in accordance with the National Transport Council Blueprint B-Triple Specification that is deemed to satisfy level 3 Performance based specification requirements with an overall maximum length of 34.29m.

The design vehicles adopted for double right turns shall provide for simultaneous movements of the Design Vehicleand a 8.8m service vehicle, with the service vehicle in the median lane.

Thedesign of left turns at unsignalised intersections may allow the Design Vehicle to enter the adjacent lane, where it can be demonstrated that:

(a)the manoeuvre is a legalmovement for the Design Vehicle;

(b)current access conditions are maintained; and

(c)reduces or results in no additional property acquisition.

3.10Traffic Lanes and Widths

The Contractor shall undertake traffic modelling to determine the number, configurations and length of traffic lanes to the meet the level of service requirements specified In addition the number of traffic lanes provided shall meet the minimum requirements as detailed in the following tables. Traffic modelling shall be based on the volumes specified in Appending D021.2.

Lane and shoulder widths are to be in accordance with Austroads Road Design Guide or the AS5100 "Bridge Design" as applicable. Notwithstanding the above, all shoulder widths shall provide for road design requirements and in particular horizontal sight distances, including for future expansion to the specified number of lanes.

The minimum number of traffic lanes on the Elevated Roadway and South Road Superway main alignment shall be as shown in the table below:

3.11Weaving Analysis

Analysis of Traffic weaving to determine the level of service between interchanges shall be undertaken using the DPTI Aimsun Modelling manual as detailed in Appendix D021.5.

Traffic movements for weaving analysis shall be determined based on the MASTEM Select Link Model (Weaving) as detailed in appendix D021.6.

4.Pedestrian Facilities

Continuous and fully accessible movements for pedestrians shall be provided at-grade for the entire length of the Works. Existing pedestrian connectivity shall be maintained.

Pedestrian crossing facilities shall be provided to connect to the east-west road network at signalised intersections, including provision of pedestrian actuated crossings.

There shall be no pedestrian provision along the Elevated Roadway and pedestrian thoroughfares are to be diverted away from Elevated Roadway on / off ramps and approach ramps

All elements of footpaths and pedestrian crossings shall allow for disability be in accordance with AS1428 Design for Access and Mobility, the Austroads Guide to Road Design and DPTI’s Guidelines for Disability Access in the pedestrian environment.

5.CyclING Facilities

Cyclist facilities shall be provided to enable connectivity between the Port River Expressway / Salisbury Highway, along the local access roadway and South Road Superway Main Alignment.

Cyclist facilities shall be designed to maintain priority and travel speed of cyclist as a road user, including provision for cyclists within the roadway and at intersections. Connections to east-west streets and intersections shall be provided to link to the existing and future local area bicycle network.

Cyclists shall be prohibited from the Elevated Roadway Structures and cyclist facilities shall not be provided along the Elevated Roadway. Measures are to be taken to restrict cyclists from the Elevated Roadway and encourage cyclists to use the local access road and not the Elevated Roadway.

Cyclist facilities shall be provided in accordance with the Austroads Guide to Road Design and AS 1742.9 Bicycle Facilities.

6.Public Transport FACILITIES

Public Transport Facilities to maintain existing public Transport Facilities shall be provided for the entire length of the Superway including indented bus bays and pedestrian shelters and bus stops.

The Contractor shall obtain approval from relevant authorities for the location and details of public transport facilities.

7.PROPERTY ACCOMMODATION

Where property driveway crossovers and stormwater drainage connections abut the works, the Contractor shall negotiate with the property owners regarding the design of crossovers and drainage connections. The Contractor shall invite the Principal to attend these negotiations. These shall include consideration of, and agreement to, the type and width of driveway crossover at the property boundary and the method of disposal of property stormwater. The Contractor shall verify that the design of the property crossovers does not allow stormwater to flow from the road down a driveway.

8.Rail Requirements

Notwithstanding other specified vertical clearances to the Elevated Roadway a minimum vertical clearance of 7.2m shall be provided from the top of rail to the underside of the Elevated Roadway over ARTC Rail corridor to cater for double stacked containers. This allowance is based upon Figure 7.17 “Rolling Stock OutlineF” in the Code of Practice for the Defined Interstate Rail Network.

Any permanent and temporary structures of the Elevated Roadway over the ARTC corridor must be in accordance with ARTC requirements and clear zones and allow for future duplication of the rail line.

All piers shall be outside the ARTC corridor. Buried works that protrude into the corridor shall be subject to approval by the ARTC. The Contractor shall be responsible for obtaining approval from the ARTC.

The railway crossing of South Road At-Grade and the Winfield Railway line shall be in accordance with ARTC requirements and shall provide an active railway crossing integrated with traffic signals, including the signals at South Terrace and Cormack Road.

Further details of design requirements are detailed in Part 170 Railway Provisions. All design of temporary Works associated with the railway shall be in accordance with permanent Works.

9.Future Expansion and Extension Considerations

The Elevated Roadway design shall include allow for future upgrades of North-South Corridor including:

connection with the Northern Connector including the proposed Northern Connector interchange;

accommodate an additional lane in each direction;

accommodate a crossing around the midpoint of the Elevated Roadway near the Grand Junction Road Ramps to allow for emergency vehicle access; and

flexibility to allow for connection to either an on-line or offline scheme for future southern upgrades of the North-South Corridor.

10.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.

Reports

Surveys or reports which address:

(a)road capacity analysis;

(b)Level of Service (LOS);

(c)traffic control and signal analysis;

(d)intersection performance;

(e)traffic barriers;

(f)incident and emergency management and integration with emergency services; and

(g)traffic weaving analysis.

Road Design Visualisation

The Contractor shall provide visualisation of the road design in accordance with Queensland Department of Main Roads, Drafting and Design Presentation Manual, Volume 1, Chapter 6 Visualisation.

The road design visualisation shall include all road design elements and entities in the geometric model to provide a realistic three dimensional image of the road design. Any urban design elements that may have an impact on the road design and in particular clear zones or sight distances, shall be included into the design visualisation.

The road design visualisation shall include a sight distance check and provided in a suitable format, including an AVI file.

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DPTI XXCxxxPage 1

[D1]Coloured text indicates where project specific information is to be inserted or example wording. Additional project specific clauses may be added.

Black text may only be modified with the approval of the Manager Contracting Services.

[RD2]Some of this information may be inserted in appendices