Sources and licence
Sources
Crash Analysis System (CAS) open data
Publisher: Waka Kotahi NZ Transport Agency (NZTA). Licence: Creative Commons Attribution 4.0 International (CC BY 4.0). The data record crashes reported to NZTA by NZ Police.
- Dataset page: https://opendata-nzta.opendata.arcgis.com/datasets/NZTA::crash-analysis-system-cas-data-1/about
- Service used (public query API, no account):
https://services.arcgis.com/CXBb7LAjgIIdcsPt/arcgis/rest/services/CAS_Data_Public/FeatureServer/0 - Records retrieved: 708,641 (all records in the open dataset at retrieval). Data last edited by the publisher: . Retrieved: .
- Years in the open data: 2006–2026 (the publisher describes the dataset as covering crashes from 2000; the open service queried here returned records from 2006 onward).
- Updates: the publisher refreshes the open data monthly. This site is rebuilt from a fresh download, never by calling the service on each page view.
Crash data: Crash Analysis System (CAS), Waka Kotahi NZ Transport Agency, licensed under CC BY 4.0. Changes made: records were reorganized by area and year, counted and charted; unrecorded values are shown as “Not recorded”. No values were estimated.
Area names and codes
Areas are the 67 territorial authorities (Stats NZ Territorial Authority 2025 classification, which also has an “Area Outside Territorial Authority” category that is not used here). Each crash is assigned to an area by the tlaId and tlaName fields recorded in CAS; this site does not reassign crashes using map boundaries.
Map boundaries
Area outlines and names on the maps come from Stats NZ Tatauranga Aotearoa, Territorial Authority 2025, published under CC BY 4.0 through Stats NZ’s public map service (https://services2.arcgis.com/vKb0s8tBIA3bdocZ/ArcGIS/rest/services/Territorial_Authority_2025/FeatureServer/0). Changes made: the outlines were simplified for display. They are drawn for orientation only.
Boundaries: Stats NZ Tatauranga Aotearoa, Territorial Authority 2025 (generalised), CC BY 4.0.
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