Why do roads on mountains have inward inclination at sharp turns?

When a vehicle moves along a horizontal curved road on a mountain, the necessary centripetal force is supplied by the force of friction between the wheels of the vehicle and the surface of the road. If there is a lack of centripetal force then the vehicle tends to skid.

When the roads on the mountain have inward inclination at sharp turns, the horizontal component of the normal reaction provides the necessary centripetal force required for the circular motion of the vehicle. Thus, to provide necessary centripetal force, mountains have an inward inclination at sharp turns.

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