Speed Camera Tolerance in New Zealand: What You Need to Know in 2026

One of the most common questions drivers ask is: how much over the speed limit can you go before a camera catches you? The answer has changed a lot in recent years, and the direction of travel is clear. Tolerances are getting tighter. Here's a detailed look at how speed camera tolerances work in New Zealand, how they've changed over the years, and how they compare with what drivers deal with in Australia and the United Kingdom.

What Is a Speed Camera Tolerance?#

A speed camera tolerance is the margin above the posted speed limit before a camera triggers an infringement. This margin exists for two practical reasons: to account for minor speedometer inaccuracies in vehicles, and to absorb small measurement uncertainties in the camera equipment itself.

A tolerance does not mean you're legally permitted to exceed the speed limit. The posted limit is the legal maximum. An infringement can be issued for any speed above the limit. The tolerance is an operational decision about where enforcement begins, not a legal right for drivers.

The lowest infringement band in New Zealand starts at just 1 km/h over the posted limit, carrying a $30 fine. There's no statutory buffer whatsoever.

Historical Context: The 10 km/h Era#

For many years, New Zealand drivers operated under the widespread understanding that speed cameras wouldn't trigger unless you were travelling at least 10 km/h over the posted limit. NZ Police never formally endorsed this as a publicised policy, but it was widely known and reflected in enforcement practice. On a 100 km/h road, most drivers believed they were safe up to 110 km/h.

This tolerance was extremely generous by international standards. It effectively allowed drivers to travel 10 percent over the posted limit without consequence, creating a de facto speed limit higher than the signed one. Opponents of broad tolerances have long argued that this undermines the credibility of speed limits and normalises speeding.

The Holiday Tolerance Reduction#

The first major public shift came when NZ Police began reducing the tolerance during holiday periods. Starting around the 2013-2014 summer campaign, Police announced a reduced tolerance of 4 km/h over the limit during high-risk holiday weekends such as Easter, Queen's Birthday, Labour Weekend, and the Christmas-New Year period.

The rationale was straightforward: holiday periods see higher traffic volumes, more unfamiliar drivers on unfamiliar roads, and historically elevated crash rates. Police argued that tighter enforcement during these periods would reduce speeds and save lives.

The results supported the decision. During the 2013-2014 summer campaign with the reduced 4 km/h tolerance, Police data showed that notices issued for speeds above 110 km/h fell by 48 to 60 percent compared with the same period in the three previous years. After a disastrous Easter period with 12 road deaths, the subsequent Queen's Birthday weekend with the reduced tolerance saw only two deaths and a 30 percent reduction in crashes.

Police reported an unexpected benefit: the lowered tolerance appeared to make drivers concentrate more on their driving and speed in general, producing safety improvements beyond just speed reduction.

Over time, the holiday tolerance was extended. What began as enforcement for individual long weekends was eventually applied from 1 December to the end of January, covering the entire summer holiday period. The reduced tolerance was also applied in school zones year-round.

The Quiet Reduction#

The bigger change happened less publicly. Reporting by RNZ and the NZ Herald revealed that Police had quietly lowered the threshold at which speed cameras activated outside of holiday periods as well. The result was dramatic: in January 2021, fixed and mobile speed cameras issued just under 20,000 notices to drivers travelling slightly over the limit. By January 2022, that figure had risen to more than 90,000. Fine revenue from these cameras rose from $600,000 in January 2021 to $2.7 million in January 2022.

When questioned, Police confirmed the changes were "due to changes in camera settings to address road safety outcome risks, resulting in a higher proportion of notices being for offences with lower infringement fees." They stated that "camera activation settings are being set in closer proximity to the speed limit." But Police didn't disclose the specific new activation threshold, and they didn't confirm whether the public had been informed of the change in advance.

This lack of transparency generated controversy. A motorist caught doing 57 km/h in a 50 km/h school zone challenged his $30 ticket, citing the previously established 10 km/h tolerance. His challenge was rejected, with Police responding that the 10 km/h figure "has not been police advice for a number of years."

The Court Case#

Kiwi motorist Mike Bryce took NZ Police to court over a $30 speeding fine incurred while driving in Kawakawa. Bryce argued that the speed he was detected at (57 km/h in a 50 km/h zone) fell within the previously established 10 km/h tolerance. Bryce lost the case (the detection was in a school zone, which had always had a lower tolerance), but the court agreed with his broader point: the current wording and communication around speed thresholds in New Zealand is confusing.

The court's finding highlighted a genuine problem. If Police change enforcement thresholds without clearly informing the public, drivers can't reasonably adjust their behaviour. I think this is the most frustrating part of the whole situation. Many drivers had relied on the informal 10 km/h tolerance for years or even decades.

Current Tolerance in 2026#

Waka Kotahi NZTA, which took over operation of all speed cameras from Police on 1 July 2025, doesn't publicly disclose the exact tolerance applied to fixed or average speed cameras. What is publicly known is:

• The tolerance is much tighter than the historical 10 km/h
• Different camera types may apply different margins
• The threshold can change at any time without public notice
• Average speed cameras are understood to apply a particularly tight tolerance, given the inherent accuracy of distance-based measurement
• Reports suggest drivers may receive infringement notices for travelling as little as 3 km/h above the posted limit

The safest assumption for any driver is that the tolerance is minimal and should not be relied upon.

Why Tolerances Are Getting Stricter#

Several factors are driving tighter enforcement:

Better Camera Technology#

Modern camera systems like the Redflex Halo 2 use 3D HD radar that tracks up to 256 vehicles simultaneously with precise lane discrimination. These systems are far more accurate than the equipment used when the 10 km/h tolerance was standard. Greater accuracy means less need for a generous error margin.

Average Speed Measurement#

Average speed cameras calculate speed over several kilometres, which inherently smooths out momentary fluctuations. A brief spike to 105 km/h while cresting a hill is absorbed into the overall average. The calculated speed more accurately reflects sustained driving behaviour, and a tighter tolerance is justified because the measurement is more reliable.

Road Safety Evidence#

Research consistently shows that even small speed reductions save lives. Work by Nilsson demonstrated that a 1 km/h reduction in average speed produces a 2 to 4 percent reduction in crashes, depending on road type. Every 1 percent increase in average speed results in a 4 percent increase in fatal crashes. When the evidence is that clear, there's a strong public health argument for minimising any tolerance that permits driving above the limit.

International Alignment#

New Zealand's historical 10 km/h tolerance was an outlier internationally. Most comparable countries operate with much tighter margins. Aligning with international practice is part of a broader trend in NZ road safety policy.

Speedometer Accuracy and Tolerance#

How Accurate Is Your Speedometer?#

The relationship between speedometer accuracy and enforcement tolerance is important and widely misunderstood.

Under regulations aligned with international standards (including UN ECE Regulation 39 and the related Australian Design Rule ADR 18/03, which New Zealand follows for imported vehicles), a vehicle's speedometer must never indicate a speed lower than the vehicle's true speed. It may overstate speed by up to 10 percent plus 6 km/h for cars and trucks, but it must never understate it.

In practice, your speedometer almost certainly reads higher than your actual speed. If your speedometer shows 100 km/h, your true speed is likely somewhere between 90 and 100 km/h. A brand-new car with correctly sized tyres might show 100 km/h when the true speed is 95-97 km/h. An older vehicle or one with non-standard tyre sizes could have a larger discrepancy.

New Zealand WoF Requirements#

The Warrant of Fitness inspection checks that a speedometer is fitted (mandatory for vehicles registered after 1 December 1951 that can exceed 50 km/h), that it operates when the vehicle is moving forward, and that it's visible to the driver. The WoF inspection doesn't test speedometer accuracy against a calibrated reference. A speedometer that works but reads 15 percent high would still pass a WoF.

So there's no routine check ensuring your speedometer gives you an accurate picture of your speed. The only guarantee is that it won't read lower than your true speed.

GPS Speed vs Speedometer Speed#

Many drivers have noticed that their GPS navigation system shows a different speed from their vehicle's speedometer. This isn't a GPS error. GPS speed measurement, when it has a clear view of the sky, is accurate to within about 0.2 km/h.

The discrepancy exists because speedometers are deliberately set to over-read. Drivers on New Zealand forums have reported typical differences of 3 to 8 km/h, with the speedometer always reading higher. One driver reported their car showing 100 km/h while GPS indicated 95 km/h. Another measured a 2.2 percent difference in trip distance between their odometer and GPS over a journey from Bombay to Auckland.

What does that mean in practice? If your speedometer shows 104 km/h on a 100 km/h road, your true speed may be closer to 97 or 98 km/h and you're likely within any reasonable tolerance. But this varies by vehicle, tyre size, tyre pressure, and tyre wear, so it can't be relied upon without verification.

NZ Police and NZTA don't accept GPS as a recognised speed measurement device. If you're pulled over, the officer's radar or the camera's reading is the legally relevant measurement, not your GPS.

How Other Countries Handle Tolerance#

Australia#

Each Australian state sets its own enforcement tolerance, and the approaches vary:

Victoria is the most transparent, publicly confirming a tolerance of 2 km/h for fixed cameras and 3 km/h for mobile cameras. Victoria tightened its fixed camera tolerance from 3 km/h to 2 km/h in 2019.

New South Wales has never officially confirmed its tolerance. The state government repeatedly states that drivers should not rely on any tolerance. Based on enforcement data, the tolerance is believed to be in the range of 2-3 km/h for fixed cameras. NSW has moved toward enforcing any detectable speeding offence above the posted limit, making it one of the strictest jurisdictions in Australia.

Queensland similarly doesn't publish its tolerance. Analysis of infringement data suggests a tolerance of approximately 2-3 km/h, consistent with other states.

The pattern across Australia is that tolerances are far tighter than New Zealand's historical 10 km/h and are trending even tighter over time.

United Kingdom#

The UK operates under guidance from the National Police Chiefs' Council (NPCC), which recommends that enforcement should commence at 10 percent above the posted limit plus 2 mph (approximately 3.2 km/h). This is guidance, not law, and individual police forces retain discretion.

In practice, this means:

• 30 mph zone (48 km/h): enforcement from 35 mph (56 km/h)
• 40 mph zone (64 km/h): enforcement from 46 mph (74 km/h)
• 50 mph zone (80 km/h): enforcement from 57 mph (92 km/h)
• 60 mph zone (97 km/h): enforcement from 68 mph (109 km/h)
• 70 mph zone (113 km/h): enforcement from 79 mph (127 km/h)

The Metropolitan Police and most other UK forces have confirmed they follow the NPCC guideline. But the NPCC guidance explicitly states that it doesn't replace police officers' discretion, and not every force necessarily adheres to it.

The UK tolerance is percentage-based rather than a flat number. It's proportionally tighter at lower speeds (where the consequences of speeding are most severe in urban areas) and slightly more generous at higher speeds (where speedometer variation is larger in absolute terms).

What Happens at the Boundary#

If you're travelling right at the tolerance limit, several factors determine whether you receive a notice:

1. Camera accuracy: Cameras are calibrated and tested annually, but all measurement has a margin of uncertainty. The tolerance is designed to absorb this.
2. Speedometer reading vs true speed: Your speedometer almost certainly over-reads, so if your speedo shows 104 km/h, your true speed is likely lower.
3. Processing review: NZTA staff review evidence before issuing notices. Images that are unclear or where there is doubt may not result in an infringement.

The practical advice is straightforward. Don't drive at the edge of a tolerance you don't know. If you drive at the posted limit (as shown on your speedometer, which over-reads), you'll almost certainly be below the enforcement threshold at all times.

Impact on Driver Behaviour#

Research on the behavioural impact of tolerance changes is limited but instructive. The NZ Police experience with holiday tolerance reductions showed that tighter enforcement produced:

• Large reductions in high-speed offending (48-60 percent fewer notices for speeds above 110 km/h)
• Reduced crash rates during enforcement periods
• An observed improvement in general driving attentiveness, beyond just speed compliance

International research supports the principle that lower tolerances change behaviour. When drivers know that enforcement begins close to the limit, they adjust their cruising speed downward. The UK's consistent 10%+2 approach has contributed to a culture where most drivers treat the posted limit as a genuine ceiling rather than a rough guide.

Average speed cameras amplify this effect. Because they measure sustained behaviour rather than a single point, drivers in average speed zones tend to set their speed at or just below the limit and maintain it, rather than fluctuating between speeding and braking. The Matakana Road results, where compliance rose from 88 percent to over 99 percent, demonstrate this clearly.

What Does All This Mean for You?#

The safest and simplest approach is to drive at or below the posted speed limit. Don't rely on a tolerance margin. It exists for measurement accuracy, not as a licence to speed. The tolerance isn't disclosed, can change without notice, and may differ between camera types.

If your speedometer shows you at the posted limit, your true speed is almost certainly below the limit due to speedometer over-reading. That gives you an inherent buffer without needing to rely on any enforcement tolerance. Honestly, it's kind of a non-issue if you just aim for the posted limit on your speedo.

If you're caught exceeding the limit, even by a small amount, you may receive an infringement notice. Check our guide to speed camera fines for the full breakdown of penalties.

To see where cameras are located, including the new average speed camera corridors being rolled out in 2026, use our interactive camera map or read our guide to the 2026 camera rollout.

Sources#

• NZ Police - Speed Limits, Cameras and Enforcement
• NZ Police - How Police Enforce Speed Limits
• NZTA - Speeding Offences and Penalties
• NZ Herald - Police Reduce Threshold for Speed Cameras
• RNZ - Police Reduce Threshold for Speed Cameras
• NZ Autocar - Court Says Police No-Tolerance Policy Is Confusing
• DrivingTests.co.nz - Speed Limit Tolerance in New Zealand
• NZTA Vehicle Inspection Portal - Speedometer Requirements
• SpeedCam Australia - Speed Camera Tolerance by State
• UK Metropolitan Police - Speed Camera Thresholds
• Motorlet UK - Speed Camera Tolerance
• EU Road Safety - Speed and Accident Risk
• Geotab - GPS Speed vs Vehicle Speedometer

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This content has been fact-checked against official sources but may contain inaccuracies. This is general information only and does not constitute legal advice.