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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.

Delivering the new Crash Analysis System

Over the last few years the NZ Transport Agency, NZ Police and the Ministry of Transport have been working to improve how road crash information is recorded, processed and then provided to the road safety community.

There have already been some changes. The NZ Police now submit crash information electronically via iPhones. The Transport Agency is maximising this data by improving and modernising CAS through a replacement project.

New Crash Analysis System - differences and user guidance

The benefit of a new CAS

The road safety community needs quality, reliable and timely information to support its road safety objectives.

A new Crash Analysis System will provide:

  • an intuitive, modern system
  • stable data
  • timely and reliable information.

To find out more about the project please subscribe to our email updates by emailing:

CAS processing update – January 2019

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 CAS.

Find out more

Access to CAS

Access to data is available in three different ways:

  • Online – open data in the form of Excel or .csv files and maps. View the open data
  • Bespoke reports created by the Transport Agency, based on customer requirements. These are usually for low frequency, complex or one-off requests, or for data that is unavailable using direct access.
  • Direct access to the system. This is controlled by a user name and password, and is usually for high frequency on-going needs.

Direct access to the data is granted only 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 (Transport Agency and approved contractors only).

CAS contains data, which is considered to be personal and/or private as defined in the Privacy Act 1993, Official Information Act 1982 and the Local Government Official Information and Meetings Act 1987. The Transport Agency takes the privacy and security of data entrusted to us very seriously. The data we collect and store 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. 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.

Apply for direct access to CAS

Training and resources

For help interpreting coded crash reports from CAS, please download this report [PDF, 594 KB].

We have also produced some CAS training videos which are available here. 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