While driving a bus, which of the following activities should be performed in order to achieve the highest efficiency of braking with the engine?
Show the correct answer
Correct answer
C. If possible engage the lowest gear.
Explanation
In the photo you can see a white intercity bus in a car park, from behind. You will get the most effective engine braking by selecting the lowest gear possible - answer C.
The Road Traffic Act requires you to drive at a speed that ensures control over the vehicle, taking into account the terrain and the load, and to brake in a way that does not cause danger. Engine braking means that the wheels drive the engine without fuel being supplied, and the engine resists. The lower the gear, the higher the revs and the stronger this resistance - that is why on a long descent you change down to a lower gear. A higher gear (answer A) weakens engine braking, and pressing the clutch (answer B) switches it off completely, because it disconnects the engine from the wheels. Remember not to change down too sharply - the revs must not go into the red zone.
Legal basis: Art. 19 para. 1 and para. 2 point 2 of the Road Traffic Act (Prawo o ruchu drogowym)