TireSafe is one of the UK's leading tire safety organisations, dedicated to raising awareness about the dangers associated with defective or illegal tires.
During the tiresafe month 2012 the organization, through the Facebook app, is promoting the 20p Test.
Using a 20 pence piece (or a 20 euro cent coin) you can quickly and easily check whether your tire tread depths are safe and legal. Simply insert the coin into your tire's main tread grooves to see if the outer rim of the coin is covered by the tread. Repeat this in all the main grooves and at several points around its circumference. If you can see the rim of the coin when it is inserted at any point, your tire may be illegal and should be checked by a tire specialist.
Take a look at app at this page and share your results !