Bindubi Street / William Hovell Drive: questions

Bindubi Street / William Hovell Drive Intersection will change dramatically with the Molonglo 3 East estate development. Bindubi Street will be extended into the heart of the Molonglo 3 East. The intersection with William Hovell Drive is expected to be popular with commuters in 2041. A grade separated interchange is planned and the first preliminary sketch plans (PSP) are available. The Feasibility Study Report is attached. Traffic studies show William Hovell Drive will exceed capacity in 2041. Finally, we will need to find space for the light rail. The facilitation of the light rail at the intersection needs to be designed in.

Related

The challenges of the topography in Molonglo 3 East and the staging of the Future Urban Area (FUA) is discussed here.

The East West Arterial / bridge and the C10 City to Molonglo Cycleway is discussed here.

The Molonglo 3 East Planning and Infrastructure Study and the reports written by the consultant WSP is discussed here.

The Molonglo 3 East Planning and Infrastructure Study and the reports written by the consultant RobertsDay is discussed here.

Design questions

The following information is available from the Bindubi St-William Hovell Drive Feasibility Report, 9 July 2019. The emphasis of this article is cycle infrastructure. Light rail is also discussed.

The CBR Cycle Route C5 Belconnen to Tuggeranong follows Bindubi Street. The grade separated interchange will include a shared path over the bridge to connect with the C5. Crossing William Hovell Drive should therefore be safe for the cyclist. Within Molonglo 3 East, the shared bike path will continue south to the East West Arterial and west to Whitlam. Looks good!

The light rail is an interesting case because the ACT Government has not committed to building it. Nobody really believes they will not, and as the construction of Molonglo Valley is happening today, it is wise to consider it. Remember, designing light rail in is easy but adding it later is hard and expensive. That is why everything needs to be built light rail ready.

What route will the light rail take. If we had decided to build it, we would know. Currently, the design is based on the assumption that the light rail will continue straight through to Belconnen. The Public Transport Association of Canberra would rather see it turn right towards Civic. Both are possible, but the bridge design will depend on this decision.

A cost estimate for the interchange is provided, so I have added that to my list.

Road infrastructure investment 2020-2040 (Molonglo era)

ProjectFunding (million)
John Gorton Drive Bridge $170
East West Arterial road and bridge $228
Bindubi Street / William Hovell Drive Interchange $47
William Hovell Drive Duplication $39
Monaroo Highway upgrade $230
Total $714
The estimate costs/funding for selected road works in the ACT. canberra.bike

4.5 Typical (bridge) Cross Section

The typical cross section for BS and BSE consists of the following:
• BS dual carriageway

2 x 3.5 m wide traffic lanes for each carriageway

12 m wide median for future IPT (light rail)

2.5 m wide on-road cycle lane for each carriageway

8 m wide verge for each carriageway which include provision for the following:
▪ 2.5 m wide shared path
▪ Street lighting
▪ Stormwater network
▪ Shared trench (presently a requirement for Evoenergy)
• BSE dual carriageway

AECOM, Feasibility Study Report, Bindubi Street – William Hovell Drive Grade Separated Interchange, 19 July 2019, 27.

Each bridge structure will carry two 3.5 m traffic lanes, a 2.5 m wide on-road cycle lane, a 1.0 m shoulder and a 2.5 – 3.0 m shared path. An allowance for an 8.6 m median infill bridge to be placed in the future to support light rail has been made. A medium performance level RCO barrier with a cycle rail has been provided at the edge of on-road cycle lane, TCCS standard balustrade and safety screens has been provided on the outer edges of each bridge

AECOM, Feasibility Study Report, Bindubi Street – William Hovell Drive Grade Separated Interchange, 19 July 2019, 44.

4.14.1 Early Works

The stormwater culvert crossing extensions, relocation and/or protection works of existing utilities are proposed to be undertaken in the early stage of works to ensure that these assets are protected or clear of the civil works. Relocation of BNT and Belconnen to City shared path is also proposed to be undertaken at this early stage of works.

AECOM, Feasibility Study Report, Bindubi Street – William Hovell Drive Grade Separated Interchange, 19 July 2019, 49.

Preliminary Cost Estimate

The preliminary cost estimate for the construction of the proposed grade-separated interchange is $47.8 million (GST Inclusive). A 40% contingency is added to the overall costs. Consultancy and management fees are excluded.

AECOM, Feasibility Study Report, Bindubi Street – William Hovell Drive Grade Separated Interchange, 19 July 2019, 58.

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