Grantham Street Multi-intersection Blackspot Treatment

  • Project typeRoad Safety Improvements
  • Project scheduleJanuary 2023 to February 2024

Background Details

The intersection of Jersey Street and Grantham Street has experienced 31 reported crashes over the past five years. To address these safety concerns, the Town is investigating the best long-term solution to improve safety at this intersection.

The Town, in consultation with Main Roads Western Australia (MRWA), has explored effective treatments to improve safety, while limiting impacts on adjacent intersections. This included a roundabout, traffic signals, and various turning movement restrictions. The feasibility of each was considered, which resulted in a Blackspot funding application for a multi-intersection treatment for the 2023/24 financial year. 

Blackspot funding is provided by State and Federal governments to make safety improvements at high-risk roads. The Jersey St and Grantham St intersection meets the funding eligibility criteria due to the high number of vehicle crashes over the past five years. 

More information is included in this Frequently Asked Questions(PDF, 315KB) info sheet.

Community Forum Sessions

Thank you to everyone who took part in the ‘Grantham & Jersey Street Intersection Road Treatment community forums held on 6 and 14 June.

A report has been prepared by the forum facilitators Aha! Consulting on the outcome of the forums. Read the report here.(PDF, 763KB)

Around 117 people from the community attended the two forums, which included:

• Project history and background

• Crash statistics

• Findings and results from the community consultation survey conducted between January to April 2023

• Potential intersection treatment options

• Funding availability through the blackspot program

• An Interactive workshop for the community to provide feedback on intersection treatment options.

We again thank everyone for their valuable contribution to the improvement of road safety in the Town of Cambridge.

July Ordinary Meeting of Council

 At the 25 July Ordinary Council Meeting (Item 11.9) was considered with the Council Decision as follows

That Council:-

1. RECEIVES the Community Forums Report as shown in Attachment 1;

2. NOTES the outcome of the Special Electors Meeting in relation to Jersey Grantham Street intersection;

3. NOTES the petition received from Tania Nicolo from Monsterella Pizza requesting a permanent treatment that does not include traffic lights;

4. NOTES the petition received from Steve Godden (Simper Street) that supports the installation of traffic lights at the intersection;

5. NOTES the petitions received of 109 signatures received from Bethany Brajkovich of McKenzie Street Wembley to request that the Town of Cambridge works with Main Roads Department to install lights at the intersection of Jersey Street and Grantham Street to prevent more accidents at this intersection;

6. NOTES the petitions received of 43 signatures received from Evita Soldo of Holland Street Wembley requesting a centralised, logical, controlled place for traffic to cross east-west across Grantham Street, between Selby St and Harborne St;

7. INSTRUCTS the CEO to undertake improvements to sightlines at the intersections of Grantham Street between Harborne and Selby Street;


a. progression of the multi-intersection treatment to detailed design and construction in the 2023/2024 Financial year;

b. the continuation of the multi-intersection treatment trail at Jersey and Pangbourne at Grantham Streets until construction commences;

c. an amount of $30,000 to be included for consideration in the 2024/2025 Draft Budget for a detailed traffic study to evaluate the performance of the Blackspot intersection treatment;

9. APPROVES an additional allocation of $120,000 from the Area Improvement Reserve to create a new project to investigate methods for lowering the speed zones, within the local area bounded by Selby Street, Herdsman Parade, Cambridge Street and Harborne Street, and to include the investigation of the installation of traffic signals;

10. INVESTIGATES other traffic treatments such as a roundabout and an integrated traffic management study from Southport St to Selby St; and

11. NOTES the development of a Movement Network Strategy to incorporate the longterm vision for the Town.

The entire report can be read following the link provided here.

Current Trial Details

Following the July Council decision to progress with the multi-intersection treatment, the following items have been actioned and or instigated.

• Approvals have been received to facilitate the replacement of the temporary traffic management signage used for the trial, with more robust fixed signage. This will mitigate the issues experienced throughout the trial with the temporary signage being moved or blown over. The new 40km p/h fixed signage has been installed with approval from Main Roads WA.

• Advanced warning signage will be installed at the Ruislip and Jersey Street intersection to alert drivers of the ‘left turn only’ at Grantham Street

• A consultant has been appointed to undertake the detailed design. The construction drawings are now underway, a Design Road Safety Audit will follow upon completion of these drawings

• Improvements to the intersection sightlines has commenced, a concept parking plan will be used to consult with the adjacent businesses and Wembley Primary School to amend on street parking. The rationalisation of kerbside infrastructure will follow the consultation.

• A request has been sent to PTA to upgrade the bus shelter this financial year. Further updates specific to the shelter will be contained in the Bus Shelter Replacement project.

The devices are installed to prohibited movements, at and through the intersections at both Jersey Street and Pangbourne Street. Available movements for each traffic lane are shown in the diagram below. These treatments will remain in place until construction which is anticipated in December 2023.


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