The conversation between human and AI assistant.
Why are the tyres of the car black? Why can't it be any other?
Why are tires not completely smooth like glass?
Tires aren't completely smooth because they need to provide maximum traction with the road. If they were completely smooth, they would have very little surface area to grip with, and they would be much more prone to slipping and sliding. The treads on tires provide more surface area, which helps to improve traction and stability.