What does "jackknifing" refer to in vehicle operation?

Jackknifing refers to a situation in vehicle operation where the trailer swings out and forms an angle with the tractor. This commonly occurs when the rear wheels of the tractor lose traction, causing the trailer to pivot sharply. This phenomenon can be dangerous as it can lead to a complete loss of control, potentially resulting in collisions or accidents. Understanding jackknifing is crucial for drivers of large vehicles, especially in adverse weather conditions or during sudden braking situations. Recognizing the signs of this condition can help drivers take preventive measures to maintain control and avoid accidents.