"When an articulated vehicle jackknifes, the cab ends up facing in the opposite direction to the trailer. As such it is impossible for the cab (which contains the engine) to move and the vehicle becomes stuck. Since a jackknifed trailer is almost always facing sideways across the lanes of a road, and since it can no longer move, these sorts of accidents can cause major congestion on roads, even if there is relatively little damage to vehicles." Wikipedia
Phil
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As far as jackknife, I think thats a media thing. Truck accidents being called "jackknife" without technically being so. I think youre right though, It did look like a good save, even though he was stuck across the highway.