Question

Grooves are made in tyres of vechicles to reduce or increase

Answer 1

Grooves are made on tyres to increase friction.

Answer 2

The grooves are also called The Tread Pattern.
. They are usually provided to increase the tractive force.
. The grooves are designed to allow water to be expelled from beneath the tire and prevent slipping.
. If manufactured precisely it can help in mitigating roadway noise.
. It can provide more grip on a soft or loose surface.