Friction can be reduced on a road by:

Rough surfaces often provide more friction than smooth surfaces. As a result, it is more successful in blocking the motion. The friction on the pitch road surface is decreased by wetting the surface, which makes it smoother. On the other hand, increasing the surface's abrasiveness by making it dry or rubbery causes an increase in friction. The surface itself will alter if it is dug up, and muck beneath the road may become visible.

Hence, the correct option is A.