What is meant by the term jack-knifing?
- When the trailer is too heavy to be drawn by the tractor.
- When the jack is not strong enough to lift an axle.
- Correct answerWhen the trailer is travelling faster than the drawing vehicle.
- When the vehicle slides due to ice or water on the road.
Explanation
Towing a trailer or caravan dramatically reduces the stability of the towing vehicle. If a driver brakes sharply or slows down quickly, the trailer may pivot around the tow hitch coupling, causing both vehicles to go off course, and possibly overturn.
Read in Chinese
“折叠”一词是什么意思？
- 当挂车过重而无法被拖拉机牵引时。
- 当千斤顶不够强大无法抬起车轴时。
- 当挂车的速度超过牵引车时。
- 当车辆因路面上的冰或水而打滑时。
拖曳拖车或大篷车会显著降低牵引车辆的稳定性。如果司机紧急刹车或快速减速，拖车可能会围绕拖钩枢轴旋转，导致两辆车偏离路线，甚至可能翻车。