Question

. Give reason : Buses and truck usually have double wheels on the rear side.​

Answer 1

Trucks and buses generally have double wheels at the back to increase the area of contact on which their weights acts and hence reduces the pressure on the ground.

Answer 2

Buses and trucks have double or even triple wheels in the back.

Explanation:

• To improve braking efficiency by increasing friction
• The extra tyres or wheels at the back are used for improved handling and braking.
• The increased area of tyres in contact with the road generates higher ground friction, which improves braking efficiency.
• The pressure on each individual tyre is reduced when more rear tyres are used.