More than 10 million UK motorists could drive a vehicle with an illegal and dangerous tyre during 2016, according to TyreSafe research.

The survey, in partnership with Highways England and announced at a Tyre Safety Month Briefing, revealed more than 27% of tyres were already illegal when they were replaced.

That equates to more than one-in-four of the 37 million cars and light commercial vehicles on the UK’s roads being driven with a tyre that could cost its driver a £2,500 fine and three penalty points, an MOT failure – or worse.

The survey’s findings confirm fears among road safety stakeholders of a poor attitude towards tyre safety among UK motorists, which is increasing the risk of drivers being involved in an incident.

Previous studies have proven that the braking distance of a vehicle with tread of 1.6mm is nearly 12m further than a vehicle with new tyres when braking in the wet from 50mph.

Stuart Jackson, chairman of TyreSafe, said: “The tread depth survey results are a concern. Figures from the Department for Transport show that dangerous tyres are the largest single contributory factor in accidents resulting in casualties of any vehicle defect – including brakes.

"If the number of casualties from tyre-related incidents is to be reduced on our roads, the UK’s motorists need to change their attitude to this primary safety feature and carry out regular checks to ensure their vehicle’s tyres are roadworthy.

“The concern comes not just from the number of illegal tyres at the point of replacement, but also the proportion which were below 2mm – those with just 0.4mm left (half the thickness of a bank card) before reaching the 1.6mm legal minimum.

"While a tyre is legal at this point, the amount of distance it can cover and remain within the law is difficult to predict and can only be verified by regular checks.

"TyreSafe’s own research has revealed one-in-five drivers have never checked their tyres and the majority of the remaining vehicle owners do not do so on a regular basis.

“The obvious conclusion is that while one-in-four tyres are illegal at the point of replacement, a further 43% are changed before reaching 1.6mm more by good luck than good judgement. TyreSafe urges drivers to check their tyres regularly before their luck runs out.”