What is "jackknifing" in the context of driving?

Jackknifing refers to a situation where a trailer swings out and forms a V shape with the tractor. This typically occurs when the trailer loses traction or begins to slide, often during sudden braking or turns. The movement creates a dangerous angle between the tractor and trailer, resembling the shape of a jackknife. Understanding this phenomenon is crucial for drivers, especially those operating large vehicles like trucks, as it can lead to loss of control and collisions if not managed properly. Recognizing potential jackknife situations allows drivers to adjust their speed and maintain better control under varying road conditions.