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147:. 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 to halt it following brake failure.
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were once commonly fitted with a lever in the cab to operate the trailer brakes (a trolley brake). The vehicle could be slowed or stopped using the trailer brakes only. Theoretically, this was a guaranteed way to prevent jackknifing; however, frequent use of the trailer brakes alone caused them to
263:, the driver, applying the foot brake, could cause the trailer to jackknife because the tractor brakes lock while the trailer brakes are ineffective due to previous overheating. Trolley brakes largely disappeared from tractor units in North America in the 1980s and 1990s
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One system with limited success was a device that mechanically limited the angle which a trailer could swing.
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varies the pressure to the rear brakes during heavy load or hard braking, enhancing driver control.
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An alternative to having a trailer brake lever in the cab is to fit the trailer with an
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while the tractor brakes remained fresh. In the event of an
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A much more successful system was to fit the tractor with
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When a trailer skids to one side, this is known as a
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56:. Unsourced material may be challenged and removed.
143:so that it resembles the acute angle of a folding
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574:List of people who died in traffic collisions
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335:Brake Pressure Regulator – Patent 3762776
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116:Learn how and when to remove this message
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179:Anti-jackknife devices
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132:How a truck jackknifes
21:Jackknife (statistics)
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65:"Jackknifing"
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61:Find sources:
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39:This article
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543:2000–present
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387:Epidemiology
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161:trailer slew
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145:pocket knife
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48:Please help
43:verification
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538:Before 2000
464:Jackknifing
392:Hit and run
380:Main topics
307:Fishtailing
297:Aquaplaning
137:Jackknifing
607:Categories
323:References
169:guard rail
106:April 2007
76:newspapers
520:Road rage
302:Black ice
223:June 2014
173:crosswind
407:Rollover
317:T-boning
275:See also
252:Tractors
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613:Trucks
498:Causes
198:is in
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