Which of the following activities should you do to initiate engine braking?
Show the correct answer
Correct answer
C. Shift down gear so that engine revolutions increase.
Explanation
The question is about the action with which you start engine braking. You shift down to a lower gear so that the engine revs increase - answer C.
The Road Traffic Act requires you to drive at a speed that ensures control of the vehicle, taking into account the shape of the terrain, and to brake safely. Engine braking means that the wheels drive the engine without fuel being supplied, and the engine resists. In a lower gear the revs are higher, so the resistance grows and the bus slows down more. A higher gear (answer A) lowers the revs and weakens engine braking. Neutral (answer B) completely disconnects the engine from the wheels - the bus then does not brake with the engine at all, and on a descent it gains speed. You shift down gradually, so that the revs do not go beyond the red area.
Legal basis: Art. 19 para. 1 and para. 2 point 2 of the Road Traffic Act (Prawo o ruchu drogowym)