The rear of buses and trucks are provided with double wheels or even more. This is provided in order to:

Increase force on the ground

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Increase pressure on the tyres

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Reduce friction

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Increase friction for efficient braking

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Solution

The correct option is D
Increase friction for efficient braking

The additional tyres or wheels at the back is used for better handling and efficient braking. The larger area of tyres in contact with the road provides more friction from the ground and therefore makes braking more efficient. Usage of more number of rear tyres reduces the pressure on the individual tyre.

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