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A jack-knife accident is when the trailer contacts the tractor by the trailer "coming around" on the driver. It is said that once a trailer exceeds a 45 degree angle, compared to the tractor, that a jack-knife is inevitable. This can be caused my many things and happens when the trailer wheels start to skid and actually ends up moving faster than the cab. Usually this happens on icy or wet roads but it can happen on dry roads when the trailer is empty and the driver has to do some very hard braking.
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