Someone asked ... what does the term "jackknife" means when referring to an accident? It is what happens when a vehicle pulling a trailer loses control in such a way that the trailer swings around and moves toward or even slams into the vehicle doing the hauling. Like the sample image shows, the truck kinda folds up life a jackknife. In a higher speed accident the trailer might smack into the cab. Or if other vehicles can become involved if they are hit by the out-of-control trailer. It isn't just truck drivers that have to worry about jackknifing. Cars or pick-ups hauling a trailer can also jackknife.
Update... the video has been removed since this post was first written... The ideas discussed in this video brought to mind one mistake I s...
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I had recently found the blog called LifeHacker , where you can find tips about modern life like getting more out of your iPod with " ...