Why are curved roads banked?

(N/A) When a vehicle moves on a curved road,it undergoes circular motion. In circular motion,a centrifugal force acts on the vehicle,tending to push it outward. To prevent the vehicle from skidding or overturning,a centripetal force is required to keep it on the curved path. By banking the road (raising the outer edge higher than the inner edge),a component of the normal force provides the necessary centripetal force,reducing the reliance on friction.