The functions of the grooves in the tyre tread, among other things:

1. ATo allow drainage of the water between the road and the tyre and to prevent wear of the tyres.
2. BTo allow efficient drainage of the water between the tyre and a wet road.
3. CTo allow drainage of the water between the road and the tyre and to prevent wear of the engine.
4. DTo allow drainage of the water between the road and the tyre and to maintain the air pressure in the tyres.

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