Tyres

Key ideas

The book states 1.6 mm as the minimum permitted tread depth for summer tyres.

The book states 3 mm as the minimum permitted tread depth for winter tyres.

Wider tyres must push aside more water and therefore have a greater risk of aquaplaning.

Applying what you learned

Tyres are the car’s contact with the road. Check tread depth, damage and pressure before relying on their grip, especially in rain or winter conditions. A tyre can meet a legal minimum yet provide less margin on a wet road than one in better condition. Adapt your speed to the conditions rather than waiting for the car to skid.

Check your understanding