How do speed zones work?
Argus uses NZTA's National Speed Limit Register (NSLR), updated weekly, as the source of the posted speed limit it checks vehicle speed against.
Most New Zealand speed zones are identified in the Argus system, using the National Speed Limit Register (NSLR) as the source of the posted speed limit at a given location. This data feeds into your Overspeed, Risk Point and Driver Behaviour reports.
Also known as / customers also ask: speed zones, speed limit data, NSLR, National Speed Limit Register, wrong speed limit, incorrect speed zone, speed limit source
What do speed zones do?
They determine the posted speed limit Argus checks your vehicles' speed against at any given location, which in turn determines whether an event is flagged as speeding on your Overspeed, Risk Point and Driver Behaviour reports.
How do speed zones work?
Argus uses the New Zealand Transport Agency's National Speed Limit Register (NSLR) as the source of the posted speed limit applying at a location. Updates are generally pushed from NZTA to Argus on a weekly cycle, typically on a Sunday — this is a general cadence, not a guaranteed schedule.
Because the register can be out of date for a particular location, Argus can manually correct a speed zone, including where you provide photographic evidence that the physical speed-limit sign has changed.
Argus only reports on, or applies risk points to, speeding vehicles that have 8 or more GPS satellites triangulating their position, to keep the data as accurate as possible. Speed zone changes take effect at the signpost: reduce your speed before reaching a sign showing a lower limit, and don't increase your speed until you've passed a sign showing a higher limit.
Who uses speed zone data, and when would I use it?
Fleet managers and safety-focused roles use it to understand overspeed events on reports, and to check whether a specific location's posted limit looks correct.
What do I need to use speed zone data?
An Argus Tracking account with access to Overspeed, Risk Point or Driver Behaviour reporting — no separate setup is needed.
How do I get started with speed zone data?
If a reported speed limit looks wrong, select Risk Point Query beside the point in question on the Risk Point Report, or submit a support ticket, to have it checked and the database updated if needed.
For more on New Zealand speed limits generally, see the New Zealand Transport Agency's About speed limits page.
This article doesn't cover school speed zones specifically — see how school speed zones work. It also doesn't cover why a specific event triggered an alert or a risk point — see why you got an overspeed alert or a risk point.