Jackknifing means the accidental of an articulated vehicle (for example one towing a trailer) such that it resembles the acute angle of a folding pocket knife. If a vehicle towing a trailer skids, the trailer can push it from behind until it spins round and faces backwards. This may be caused by equipment failure, improper braking, or adverse road conditions such as an icy road surface. Jackknifing isn't very common and usually only happens to an empty vehicle. Most truck drivers are skillful… (More on Jackknifing)