what does it mean to jackknife a trailer
Jackknifing Jackknifing refers to the folding of an articulated vehicle i.e. 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 the towing vehicle from behind until it spins the vehicle around and faces backwards. This may be caused by equipment failure, improper braking, or adverse road conditions such as an icy road surface. In extreme circumstances, a driver may attempt to jackknife the vehicle deliberately in order to halt it following brake failure. A jackknife event of a heavy vehicle can be fatal to the driver as the top of the cab can be crushed or sliced off as it swings round violently and tries to fold under the trailer.[citation needed]
Pickup truck The term pickup is of unknown origin. It was used by Studebaker in 1913 and by the 1930s, "pick-up" (hyphenated) had become the standard term.[5] In Australia and New Zealand, "ute", short for utility vehicle, is used for both pickups and coupé utilities. In South Africa, people of all language groups use the term bakkie, a diminutive of bak, Afrikaans for bowl/container, due to the cargo area's similarities with a bowl and container.