Great Eastern Highway Safety Upgrade: Bilgoman Road to Mann Street

This 7.2 km section of Great Eastern Highway was built in the 1950s and upgraded to a dual carriageway in the 1970s. It now carries about 25,000 vehicles per day and 70 per cent of this traffic is generated from within the Shire of Mundaring.

This project is upgrading the highway in two sections. Stage 1 construction works from Kintore Road to Mann Street were completed in 2017 and revegetation of this 2 km section is complete.

Stage 2 will complete the 5.2 km section between Bilgoman Road, Glen Forrest, and Kintore Road by mid-2019.

The project is jointly funded with $34 million from the Australian and Western Australian Governments and supported by the Shire of Mundaring.

Latest news

Georgiou Group has been appointed to complete the Stage 2 roadworks, which are well underway.

Western Power has also relocated its power lines and will return later this year to complete street lighting upgrades.

To protect road users and workers as construction activity and roadside hazards increase, the posted speed limit has been reduced to a maximum of 60 km/h on Great Eastern Highway between Bilgoman and Kintore roads. This will remain in place for the duration of the works. 

Road users should also expect reductions to 40 km/h to allow for various construction activities, as well as lane closures and occasional side street intersection closures for drainage works, with signed detours in place.

Please expect occasional delays and observe roadworks signage.

General working hours are Monday to Saturday, 7am to 7pm. Some work, including traffic management set up, may be conducted outside these hours, subject to approval by the Shire of Mundaring. Every effort will be made to minimise disruption to residents living close to the work site. This includes noise and dust mitigation, and full reinstatement of roads and verges.

Read our August 2018 Project Update.

Scope of works

Stage 2 includes:

  • 5.2 km of widening to provide sealed shoulders
  • 4.5 km of new drainage
  • New or extended turning pockets at all intersections
  • New street lighting to Australian standards
  • New shared paths linking new sealed bus bays
  • New road markings, advance warning signs and guide posts
  • 11 km of safety barriers

It also includes new crossovers to tie into existing driveways for residential and business properties fronting Great Eastern Highway. Written notification will be provided to residents, before this work is undertaken.


We completed a biological survey for the site and refined the Stage 2 design several times to minimise the impact of clearing.

Some of the ways we are preserving vegetation include:

  • maintaining the current level of carriageways to avoid any unnecessary damage to underground root systems
  • installing safety barriers on both sides of the median. While safety standards require 1.2 m deflection zone (clear zone) behind these safety barriers to the nearest tree, in wider sections of the median at least eight to 10 metres of vegetation will be preserved
  • locating street lights within the verge, where practical, to avoid additional clearing in the median. Where this is not possible, double outreach poles are proposed in the median to keep clearing to a minimum.

In accordance with our environmental processes, the clearing extents for this project were also reviewed by the Shire of Mundaring and the Department of Biodiversity, Conservation and Attractions.

All vegetation cleared for this project will continue to be mulched and re-used on-site. A replanting program featuring local species is being delivered for Stage 1 in consultation with the Shire of Mundaring. Further replanting will be undertaken in mid-2019 to complete Stage 2 works.

We will also recycle concrete kerbs, paths and asphalt.


 Image: Stage 1 has been completed and includes sealed bus lanes and safety barriers


Key benefits

  • Improve safety and efficiency
  • Enhance pedestrian and cycling facilities


​Key dates

Stage 2

  • September 2018: Construction starts
  • March 2019 to July 2019: Lighting
  • Mid-2019: Revegetation
Last Updated: 11 January 2019