between the road and the tires helps to bring the car to a stop as the wheels slow down. it is the friction between the wheels and the brake pads that causes the wheels to slow down. obviously, friction is a very important force when you are riding in a car!
imagine that there was a lot less friction between roads and tires. pretend that there was the same amount of friction as there is between your shoe and ice if you walked across an ice-covered lake. what would happen? cars would be slipping all over the road because the friction between the road and tire would not be sufficient enough 