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Why are the roads banked?

Updated: 4/28/2022
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13y ago

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Newton stated that a body will continue in a straight line unless acted on by an external force. To go round a corner, the wheels are turned, and the friction of the tyres provides a centripetal force which persuades the car to abandon its straight line and go round the corner. This happens whether the road is banked or not. However, this force on the tyre does not act through the centre of mass of the vehicle. In physical terms, this is a rotational force as far as the car is concerned, and the practical effect is that the car tends to lean outward in the turn, to the extent that the inner tyres may leave the road. If the road is banked in the curve, the effect of gravity tends to make the car rotate into the centre of the curve, opposing the outward rotation. This makes the car feel more stable, as there is less outward rotational tendency. (This is why motorcyclists have to lean over in curves.)

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Q: Why are the roads banked?
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