TMS daily traffic counts API

Daily-updated traffic volumes from state highway count

sites, by vehicle type.

You can also access a zipped csv file version of this



(traffic monitoring system) daily-updated traffic counts CSV


Data reuse caveats: as per license.


Data quality

statement: please read the accompanying user manual, explaining:


 this data is collected identification

 of count stations traffic

 monitoring technology monitoring

 hierarchy and conventions typical

 survey specification data

 calculation TMS



monitoring for state highways: user manual

[PDF 465 KB]

The data is at daily granularity. However, the actual update

frequency of the data depends on the contract the site falls within. For telemetry

sites it's once a week on a Wednesday. Some regional sites are fortnightly, and

some monthly or quarterly. Some are only 4 weeks a year, with timing depending

on contractors’ programme of work.


Data quality caveats: you must use this data in

conjunction with the user manual and the following caveats.


 road sensors used in data collection are subject to both technical errors and

 environmental interference.Data

 is compiled from a variety of sources. Accuracy may vary and the data

 should only be used as a guide.As

 not all road sections are monitored, a direct calculation of Vehicle

 Kilometres Travelled (VKT) for a region is not possible.Data

 is sourced from Waka Kotahi New Zealand Transport Agency TMS data.For

 sites that use dual loops classification is by length. Vehicles with a length of less than 5.5m are

 classed as light vehicles. Vehicles over 11m long are classed as heavy

 vehicles. Vehicles between 5.5 and 11m are split 50:50 into light and


The NZTA Vehicle

Classification Relationships diagram below shows the length classification (typically dual loops) and axle classification (typically pneumatic tube counts),

and how these map to the Monetised benefits and costs manual, table A37,

page 254.

Monetised benefits and costs manual [PDF 9 MB]

For the full TMS

classification schema see Appendix A of the traffic counting manual vehicle

classification scheme (NZTA 2011), below.

Traffic monitoring for state highways: user manual [PDF 465 KB]

State highway traffic monitoring (map)

State highway traffic monitoring sites


(traffic monitoring system) traffic – historic quarter hourly

Data and Resources

Additional Info

Field Value
Theme ["geospatial"]
Author Waka Kotahi
Maintainer Open.Data_NZTA
Maintainer Email Open.Data_NZTA
Created 2020-06-16T23:10:30.000Z
Date modified 2021-04-29T23:38:52.000Z
Language English
Spatial {"type": "Polygon", "coordinates": [[[-180, -89.99], [180, -89.99], [180, 89.99], [-180, 89.99], [-180, -89.99]]]}
Source Identifier
Record created May 11, 2021, Last Updated May 13, 2021