The Traffic Road Event Information System (TREIS) API lets you access real time data on events / incidents that affect traffic conditions across the network of national highways in New Zealand. An example of an event/incident could include road works, an accident, or weather related problems such as ice or snow.

Note: this information is ONLY for notable events/incidents that may cause delays to road users or require caution, and only where the details have been verified by the Waka Kotahi or another official source.

NZTA highway information API - more info (nzta.govt.nz)

The TREIS API makes three sets of data available:

Events / incidentsThis is a detailed list of confirmed events/incidents on the state highway with a specified location. For example, caution advised due to a land slip blocking one lane of traffic. General warnings – North IslandThese are the general warning messages that apply to a wider geographic area within the North Island. For example, widespread flooding and slips in the Hawke’s Bay area. General warnings – South IslandThe same as 2), but only for the South Island. For example, "Otago And Southland winter conditions exist and motorists are Advised to watch for ice and grit in shaded areas and on bridge decks and to carry chains especially when travelling the alpine passes".

Additional details

More detail is available in the TREIS webservices documentation, which covers:

specification of the TREIS web services API information on how to connect to the TREIS web services API.

REIS webservices documentation [PDF 203 KB]

This document is intended for data architects and developers that must integrate their applications with the TREIS web services API.