Motorists who do not even know how to pump their tyres are running the risk of unnecessary fines and points on their driving licences.
Just a single defective or bald tyre can cost a motorist up to £2,500 in fines and three penalty points.
Even worse, if the car is in an accident, the insurance company will check if the tyres are legal and refuse to meet any claim if they fail the test.
Yet despite the overwhelming reasons to look after one of the most basic of car maintenance issues, 57 per cent of drivers do not know the minimum tyre tread depth, according to a poll for Tyre Safety Month by web site confused.com.
Other shocking revelations include around six out of 10 drivers who are unaware of the correct tyre pressures for their vehicles.
The findings also reveal young drivers up to 24 years old are less likely to know how to inflate their tyres and nearly nine out of 10 drivers do not change their tyres for winter conditions on the roads.
And the dumbest 1.4 per cent of drivers confessed they did not know their car tyres contained air.
A web site spokesman said: “Tyre maintenance may not sound like the most exciting topic on the planet but is important to basic road safety. If your tyres have too much or too little air, this can wear the tread of tyres down quickly.
“If a tyre has a tread of less than 1.6mm it is qualified as an illegal tyre. If the police stop someone with an illegal tyre they will be fined up to £2,500 for each illegal tyre. If someone is in a crash and their tyres are below the legal tread limit, a fine can be issued causing their insurance to be denied.
A simple tyre check is placing a 20p coin in to the main tread of the tyre. If the coin rim is covered by the tread, the tyre is legal.
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