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Crash Analysis System (CAS)

The NZ Transport Agency manages the Crash Analysis System (CAS) - New Zealand’s primary tool for capturing information on where, when and how road crashes occur.

The system provides tools to analyse and map crashes and enables users to identify high-risk locations and monitor trends and crash sites. This information helps inform transport policy, design and prioritise road safety improvements and monitor their effectiveness.

CAS is used by a range of organisations all with the broad aim of improving road safety. It is an essential tool in supporting Safer Journeys and its vision of a ‘safe road system increasingly free of death and serious injury’. It enables the transport sector, over the long term, to improve road safety through knowledge, research and the measurements of the effects of changes to the network and network user behaviour.

CAS Processing Update - March 2017

We have target processing times for all crash reports. These targets relate to the time taken from the date that the crash report is received by The Transport Agency until the time it is entered in the crash analysis system (CAS). 

Find out more

Access to CAS

CAS users can access the system here (external link) .

You can apply for free access to CAS data for the following purposes:

  • Informing transport policy and regulations,
  • Designing and prioritising a range of network user behaviour and road safety initiatives,
  • Supporting funding applications for network and road safety improvements,
  • Monitoring and evaluating the effectiveness of road safety initiatives, and
  • Providing information for research purposes connected with road network user behaviour, road safety and transport policy.

To apply for free access to CAS, please contact us at

Training and resources

For help interpreting coded crash reports from CAS, please download this report (external link) .

We have also produced some CAS training videos which are available here (external link) . They will help you log in, extract data, create reports and use other tools available in CAS. 

Road safety information and tools

Information and tools to support road safety are available here.

Contact us

If you have any questions relating to CAS, please contact us at