Crash Investigation

In cooperation with local governments, we conduct crash location investigations after the occurrence of a fatal or serious casualty crash.

The primary focus of crash investigations is to identify road environment factors which may possibly be related to the cause of a crash or may have increased the severity of a crash.

Crash investigations are undertaken using a two stage process;

  • Preliminary Crash Investigations which should occur within 7 working days of the crash; and
  • Detailed Crash Investigations which are completed only if a road environment factor possibly related to the cause or severity of a crash is identified in the preliminary crash investigation.

Crash Map 

Crash Analysis Reporting System (CARS) is software in use throughout Western Australia for the analysis of reported road crashes. The crash data is available to state and local government road asset managers, and also to consultants engaged to complete work on behalf of these agencies.

In order to gain access to CARS, you are required to complete the following steps:

  1. Create an account with Main Roads.
  2. Validate your account by clicking on the link in an email that will be sent you (if not received in your inbox, check your Junk or Spam folder)
  3. Download and complete the CARS Application form
  4. Send the completed application form to

You may wish to refer to the list of Road Use Movement Codes for CARS.

Treatment of Crash Locations course

The Road Safety Engineering - Treatment of Crash Locations course is available now via the Road Safety Audit Portal.

This is a vital training resource for people involved in the treatment of crash locations for programs such as the Federal and State funded Black Spot programs in Western Australia.

Intersection Crash Ranking - Interactive Report

This tool allows you to produce reports on intersection crash statistics throughout the State.

CARS Account

Find out more about our Crash Analysis Reporting System (CARS) section to learn about this app. If you have a CARS account, please login here.

Login to CARS

Acknowledgement of country

The Government of Western Australia acknowledges the traditional custodians throughout Western Australia and their continuing connection to the land, waters and community. We pay our respects to all members of the Aboriginal communities and their cultures; and to Elders both past and present.

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