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By law, the depth of tread on a car tyre must be a particular depth. In the UK this should be a minimum of 1.6mm in a continuous band throughout the central three-quarters of the tread width, throughout the whole of the circumference. Worn tears will mean that the car will not be able to stop within a legal distance, which could easily lead to accidents.

Draw two rough designs for a symbol to represent tyre tread checks that are carried out by a garage.