What does excessive wear on the outer edges of the tread of a car’s tyre generally indicate?

Explanation: If you don't keep your tyres inflated to the recommended pressure, they may wear unevenly. Over-inflated tyres will tend to wear heavily in the centre tread area, while under-inflated tyres will tend to wear more on their outer edges. Check your tyres regularly and use a reliable gauge. Follow the manufacturer's guide for the correct tyre pressure; check and adjust the pressure when the tyres are cold.

Category: Band 2 traffic signs and signals

References: The Official DVSA Guide to Driving: Section 14