Technically, whiplash most commonly occurs when someone is stopped at a light or stop sign and gets rear ended by the car behind them, causing the head and body to jerk forward and backwards violently.

So you can (and usually do) get whiplash injuries while at a complete stop. Whiplash neck injuries can occur when the rear car is going as slowly as 5 MPH, but is more common in moderate and high-speed auto accidents with additional injuries to the neck, back, and other areas of the body. Concussions are also very common car accidents involving more serious whiplash injuries, due to the fact that when the head snaps back and forth as described above, the brain can rattle around inside the skull, causing bruising and swelling of the brain and other head injuries in higher speed car accidents.  

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