Question

why treads made in the surface of tyres

Answer 1

The grooves that you see on your tires work to siphon water away from the tires when the roadway is wet. This can help to reduce the risk of hydroplaning when traveling at higher speeds on a wet road or highway. If the treads on the tire are not at the proper depth, it can become difficult for enough water to be carried out from beneath the tire, thus increasing the possibility that you could lose control in such conditions.

Answer 2

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Treads are made on the surface of tyres help in increasing the friction. These treads help in maintaining a firm grip on the road which reduces the risk of slipping on the road thus avoiding accidents.