What does "jackknifing" refer to?

Jackknifing refers to a situation in which a trailer swings out and forms an angle with the cab of the truck, resembling a folding jackknife. This typically occurs when there is a loss of traction, often due to braking too hard, driving too fast for conditions, or poor road conditions. The result is that the trailer pivots around its hitch point, moving in a direction different from that of the cab, which can lead to a dangerous and unstable situation. Understanding jackknifing is crucial for CDL drivers as it emphasizes the importance of maintaining control over both the cab and trailer while driving, particularly under adverse conditions. This knowledge helps drivers take preventive measures to avoid such situations, ensuring safer driving practices on the road.