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Roads are banked at the turnings, why?

Roads are banked at the turnings, why?

When a vehicle moves in a turning, a centripetal force is required to prevent it from skidding on. The required centripetal force is provided by friction between the tires and the road. However it is not safe to rely only on friction because this friction reduces when the road becomes wet. When the road is banked at the turnings, the component of the normal reaction in the direction toward the center of the banked road provides the necessary centripetal force. This ensures that driving a vehicle is safe even when the road is wet.

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