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Crash Analysis System (CAS)

Waka Kotahi 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 the Government’s road safety strategy Road to Zero. The strategy adopts a Vision Zero approach – a New Zealand where no-one is killed or seriously injured in road crashes, and where no death or serious injury while travelling on our roads is acceptable. CAS 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.

Road to Zero(external link)

Access to CAS

CAS contains data, which is considered personal and private as defined in the Privacy Act 1993, Official Information Act 1982 and the Local Government Official Information and Meetings Act 1987.

Waka Kotahi takes the privacy and security of data very seriously. The data collected and stored is used for research and decision-making aimed at improving road safety, and as such benefits all New Zealand road users. We can also link CAS data to data from other sources to improve its usefulness to recipients.

Access to data is available in three different ways:

  1. Online - open data in the form of Excel or .csv files and maps.
    CAS open data portal(external link)

  2. Bespoke reports created by Waka Kotahi, based on customer requirements. These are usually for low frequency, complex or one-off requests, or for data that is unavailable using direct access. Where appropriate, the provision of data as bespoke reports containing private information or via direct access to the system will require a data agreement, which places obligations on users to handle this information appropriately and in accordance with the law.
    For any specific requests for information from CAS, email

  3. Direct access to the system. This is only available to approved users, usually for high frequency on-going needs and may only be granted for one or more of the following purposes:
    • informing transport policy and regulations
    • designing and prioritising a range of road user behaviour and road safety initiatives
    • supporting funding applications for network and road safety improvements
    • monitoring and evaluating the effectiveness of road safety initiatives
    • providing statistics to support a wide range of public information requests
    • providing information for research purposes connected with road network user behaviour, road safety and transport policy
    • administering the Crash Analysis System (Waka Kotahi and approved contractors only).

Apply for direct access to CAS

Processing of crash data

The table below shows the Crash Analysis System (CAS) data availability, upon receipt of a traffic crash report:

Type of crash




Data available in CAS

 1 working day

1 working day

 Up to 7 months

* As at 20 July 2021

Tools and resources

CAS differences in data between the current and previous system

Causative and contributory factor codes [PDF, 125 KB]

Vehicle movement codes [PDF, 3.5 MB]

Tips for using CAS - including sites, state highway buffers and collision diagrams [PDF, 237 KB]

Known CAS issues and requests for improvements

How to get help with CAS

  • Learn how to use CAS with the online training portal CAS Learn. Courses include overviews of query functionality, using maps, reporting functionality, and using collision diagrams.
    CAS Learn(external link)
  • For advice or help on any specific queries, email
  • For any password or connectivity issues, phone the Waka Kotahi NZ Transport Agency Service Desk on 0800 805 263.