When the outer edge of the road are leveled up at a particular angle in comparison to the inner edge of the road, it is known as banking.
Banking is necessary for a curved road so that a four wheeler vehicle like car can take a turn while moving on a curved road because banking helps to produce a centripetal force towards the inner edge of the road due to the horizontal component of the normal reaction required for the circular motion of the car.
Final Answer:
Hence, banking is required to produce necessary centripetal force required by a four wheeler vehicle to turn or move in circular motion.
