Point Lewis Roundabout

Main Roads has undertaken an innovative new project to improve safety and efficiency at the intersection of Mounts Bay Road, Kwinana Freeway southbound on-ramp and Riverside Drive. 

In an effort to address congestion and safety issues, Point Lewis roundabout was the first intersection in WA to have roundabout metering. 


What is roundabout metering?

The project involved the installation of red/yellow traffic signals on the Mounts Bay Road eastbound approach.

Queue detectors were installed on the Kwinana Freeway on-ramp and on Mounts Bay Road, coming from the northern (Perth) area. These detectors determine traffic volumes and subsequently activate the signals.

The signals consist of red, yellow and blank phases.

  • Red means drivers must stop
  • Yellow means stop if safe to do so
  • No signal (blank) means proceed through and follow normal roundabout rules.

These signals only operate during peak periods. At all other times, unless there is significant traffic build up,  normal roundabout rules will apply.

Image: roundabout metering animation image.RCN-D13^23514926.JPG

 Video: Animation showing how the signalised roundabout will operate (wmv)



Image: metered roundabout diagram.RCN-D13^23518321.JPG


Image: Diagram of how the roundabout will work with the red and yellow traffic signals (jpeg)


Why was roundabout metering chosen?

Video surveying and modeling of the roundabout and surrounding networks showed that the roundabout experienced heavy congestion during morning and afternoon peak periods.

Roundabout metering was therefore chosen as an optimal solution, where installed detectors would activate these new red/yellow traffic signals when required to assist in the movement of built up traffic on Kwinana Freeway and Mounts Bay Road (coming from Perth).

Road users on Mounts Bay Road eastbound will experience only slight delays at the signals. As a whole, the intersection will work more efficiently.


Project Benefits

Since it's inception on 9 November 2013, the addition of roundabout metering has delivered a 750m reduction in queue length for traffic heading westbound, from 900m to 150m.  Other benefits include:

  • Improved public transport efficiency along Mounts Bay Road
  • Prevent traffic gridlock during peak periods, particularly at Mounts Bay Road from Perth City in the morning and the Freeway southbound in the afternoon
  • Reduce the crash rate and severity of crashes in the area.

A full review and evaluation will be conducted in March 2014.


Further information

A Newsletter is available for download and provides further details about the project.

For any further queries regarding this project please contact our Customer Information Centre of 138 138 or email enquiries@mainroads.wa.gov.au.

Modified: 25 Jul 2014