A: In the context of commercial truck accidents, to "Jackknife" means to place the trailer at a very sharp angle to the tractor.  This often causes the trailer to cross other lanes of travel and happens when there is a sudden application of the brakes Jackknife accidents can lead to serious and sometimes fatal consequences when vehicles in adjacent lanes or following vehicles are unable to stop in time.

If you or someone you love has been involved in a Pennsylvania tractor trailer accident or some other large truck accident, you may want to get an estimate of the value of your case to ensure you're being treated fairly by the insurance company or you may want help investigating your semi-trailer accident case to ensure that responsibility for the accident is appropriately placed.  You may want to speak with an experienced northwest Pennsylvania truck accident lawyer.  Most Erie injury lawyers offer free consults so it shouldn't cost you anything just to speak with someone.