What can often cause jackknifing in trailers?

Jackknifing in trailers is commonly caused by poor braking techniques. When a driver applies the brakes abruptly or unevenly, especially in a combination vehicle like a truck and trailer, it can lead to the trailer swinging out to the side relative to the towing vehicle. This motion is typically a result of the rear wheels of the towing vehicle losing traction while the trailer continues to move forward, creating an angle between the truck and the trailer that resembles a jackknife.

Proper braking techniques, including gradual application of brakes and maintaining appropriate distances, are crucial for preventing this dangerous scenario. Understanding this concept is vital for drivers, as effective braking not only maintains control but also ensures safe maneuvering of heavy trailers.