What necessary activities should be performed by a bus driver while replacing a wheel on the road?
Show the correct answer
Correct answer
B. Raise the vehicle with a jack to a sufficient height to create a distance between the tyre and the surface.
Explanation
In the photo, you can see a close-up of the front wheel of a bus and part of the bodywork with a service flap. When changing a wheel, you raise the vehicle with a jack high enough to create a gap between the tyre and the ground that lets you fit a working wheel - answer B.
The Road Traffic Act requires you to take the precautions necessary to avoid an accident while the vehicle is parked, and in certain situations a vehicle parked because of a breakdown must be marked. When you change a wheel, the engine must be switched off (answer A is wrong), because a running engine is a risk that the bus will move off by accident. The parking brake must be applied (answer C is dangerous) - if it is released, the raised bus can roll and fall off the jack; you also put wheel chocks under the wheels on the other side. First you slightly loosen the wheel nuts while the wheel is standing on the ground, and only then do you raise the bus just as much as needed to take off the old wheel and fit the new one. The higher the vehicle is raised, the more easily it can slide off the jack.
Legal basis: Art. 46 para. 5 and Art. 50 para. 1 of the Road Traffic Act (Prawo o ruchu drogowym)