A car repair company has produced a "tyre wall of shame" 2009 calendar to highlight the problem of motorists taking to the road with poor quality tyres.
A survey by Kwik-Fit found that 20% of motorists drive on under-inflated tyres and 10% have tyres below the legal tread depth of 1.6mm.
The calendar is made up of pictures of the most dangerous tyres brought in for service by customers during 2008.
The company has said that driving with under-inflated tyres can cause a sudden tyre failure, such as a blowout, which could lead to a serious accident. Tyres with a tread beneath the legal minimum of 1.6mm will affect a car's braking power, which could be particularly treacherous in wintry conditions.
David White, Kwik-Fit customer services director, said: "The really scary part is that, while each tyre represents the worst example seen in that particular month, they are just the tip of the iceberg.
"We saw enough tyres like these in 2008 to fill at least 50 calendars."
© Press Association 2008