​​​​​Traffic signal timing improvement project

The problem

Traffic signal timings degrade over time due to changes in land use, traffic demand and road network enhancements. This can lead to traffic signal timings becoming less responsive to users' needs, increasing delays across the network, causing congestion at signals and reducing the consistency of travel times.

The solution

We have implemented an ongoing program to improve the timing and coordination of traffic signals across all metropolitan state road routes during the peak periods. Even slight changes to signal timings and coordination can significantly improve traffic flow across our network.  As traffic signals require regular adjustments to stay up-to-date with changing traffic conditions and customer travel experience expectations, our program is reviewed yearly.

You can see the results of our 2014/15 optimisation program by clicking on the following interactive map:


[Under Construction]

​The results

Since we first began the program in 2014, commuters have saved up to five minutes on their journeys along some of Perth's most popular roads, including Canning Highway, Stock Road and Orrong Road. Each year, we add more signals to our program to ensure we cover all roads across the metropolitan state road network.  

In 2016-17, we reviewed our highest number yet with over 400 sets of traffic signals across 23 routes. With our review program in place for several years, most traffic signal timings are now operating optimally during peak times. Despite an increase in traffic volumes at peak times in 2016-17, we still made journey time savings on some of our busiest roads.

Overall,  journey times have reduced by over 22 minutes in the morning peak and over 32 minutes during the afternoon peak network-wide. That's a 3.6 per cent saving network-wide in morning peaks for journeys to the city and a 4.5 per cent saving for journeys heading out of the city.

Some of the most improved routes in the 2016-17 program include:

Morning peaks

  • Orrong Road: westbound journey times improved by over 1 minute (7 per cent improvement).
  • Roe Highway: southbound journey times improved by over 1 minute (7 per cent improvement) while traffic volumes increased by 11 per cent.
  • South Street: westbound journey times improved by nearly 2 minutes (9 per cent improvement) while traffic volumes increased by 4 per cent.

Afternoon peaks

  • Ennis Avenue/Mandurah Road: southbound journey times improved by nearly 2 minutes (9 per cent improvement) while traffic volumes increased by 1 per cent.
  • Great Eastern Highway (Farrall Road to Kalamunda Road): eastbound journey times improved by over 2 minutes (14 per cent improvement) while traffic volumes decreased by 2 per cent.
  • Stirling Highway: east and westbound journey times improved by nearly 1 minute each (5 per cent improvement) while traffic volumes increased by 4 per cent and 3 per cent respectively.

The map below shows the routes on the metropolitan state road network that formed part of the 2016-17 review.

In addition, traffic signals were also reviewed on Mitchell Freeway, Kwinana Freeway, Graham Farmer Freeway and Great Northern Highway.

 

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Last Updated: 14 August 2017