Final answer:
Tires become less effective as you drive faster due to increased friction with the road surface.
Step-by-step explanation:
As you drive faster, tires become less effective mainly due to increased friction with the road surface. The friction between the tires and the road generates the centripetal force needed to keep the car moving in a curved path. However, as the speed increases, the friction between the tires and the road also increases, leading to a decrease in the effectiveness of the tires.