Speed camera alert apps: what an Australian Waze study found

Speed camera alert apps such as Waze appear to change how drivers behave, but only while a warning is live, according to an Australian study. Researchers at the University of the Sunshine Coast found that more than 50% of drivers were speeding before a police enforcement alert appeared on Waze, and about 25% after it. This article sets out what the research found and what it can and cannot tell UK drivers, because the study did not involve UK police.

That limit matters. The angle that British officers say app-based tactics do not work, and that fines still arrive, is not something the research supports. No UK police force is quoted in the material we have, so we have not attributed any view to one.

What the Waze study found

The paper, titled "Waze to beat the system", was published in the Journal of Experimental Criminology. Researchers used a laser speed measurement device to record more than 9,000 vehicle speeds across 33 sites in southeast Queensland. The sites included arterial roads, residential streets, school zones, commercial or industrial areas and road construction sites.

The effect appeared at every site. Across all zones, the average difference between speeds before and after an alert was about 5 km/h, or 3 mph. Dr Levi Anderson, a research associate at the university, said: "Drivers weren’t slowing down because of the speed limit. They were slowing because their phone told them there would be police ahead."

The alerts also came quickly. Anderson said they usually appeared within a 14-minute window of researchers starting to take measurements. Waze is a Google subsidiary with more than 150 million monthly active users worldwide, and a third of Australian drivers reportedly use apps such as Waze to share road and traffic observations.

Who pays more, who pays less

The study did not measure fines, so it cannot say who ends up paying more or less. What it does show is who changes behaviour. Drivers who saw an alert tended to slow down, which in practice means fewer of them are exposed to a penalty at that spot, at that moment.

The researchers did not claim that this makes a driver safe from enforcement. Anderson said: "Drivers who did not slow may not have had the Waze app, or hoped their illegal speed was insufficient to trigger an infringement notice." In other words, some drivers kept speeding through an alert, and those are the ones who risk a penalty.

The researchers also raise a longer-term concern. Anderson said the findings, along with other research, suggest alerts give a short-term, local benefit at particular sites, but are "a long-term detriment to road safety as drivers become emboldened to speed if the app doesn’t warn them about police ahead." The driver who relies on the app is therefore the one most exposed when it stays silent.

A worked example

The clearest figures come from the 100 km/h zones, which is 62 mph. There, the proportion of speeding drivers fell from 64% to 12% after an enforcement alert was shared. Taking 100 drivers as an illustration, that is 64 speeding before the alert and 12 after, so 52 drivers eased off. That is a fall of about 81% in the number speeding, by our calculation from the researchers’ figures.

Now compare the active school zones, where the limit was 40 km/h, or 25 mph. The researchers recorded the smallest reaction there. Of every 100 drivers, 38 carried on above the limit despite an app alert.

Across all zones, the share of drivers speeding roughly halved, from above 50% to about 25%. Yet the average speed changed by only about 3 mph. That suggests many drivers who had been well over the limit slowed sharply, while others barely moved. The researchers said the biggest changes came on highways, especially at road construction sites.

What to do now

The practical lesson for a driver is simple. An alert is not protection, and a quiet app is not a guarantee that nobody is checking. The study found that drivers who slowed did so because of a warning, and that the warning came only after police were already in place.

If you use a navigation app, set your speed by the posted limit and treat any alert as a reminder rather than a plan. Be especially careful near schools, where the study found the weakest response. Do not handle a phone while driving to report or check alerts; leave that to a passenger or use voice controls where they are available.

If you want to know where the law stands on using such apps in the UK, or how much leeway enforcement allows, check the published guidance from your local police force and national road safety bodies. The sources we have do not cover UK law or enforcement thresholds, so we have not guessed at them.

Your questions answered

Is Waze accurate for speed cameras?

This study does not test that. It looked at crowdsourced alerts about police enforcement in Queensland and whether drivers reacted to them, not whether the app correctly maps fixed cameras. It did find that alerts usually appeared within 14 minutes of researchers starting to take measurements, which suggests users report quickly, but that is not a measure of accuracy.

Does Waze warn you about speed cameras?

The study describes Waze as an app where users share observations of road and traffic conditions, and says alerts about police enforcement did appear. It does not set out how Waze handles fixed speed cameras in the UK.

Will I get a ticket if I go 33 in a 30?

The sources do not say. The study is from Australia and gives no UK tolerance figures. Anderson said some drivers hoped their illegal speed was too small to trigger an infringement notice, but he did not say what that threshold is. The safest approach is to stay at or below the limit and check your local force’s guidance.