Movie where two woman are held hostage in what i assume is either a van or small rv and they attempt to escape. One woman signals truck behind them that they are in trouble and truck pulls up in front of them and slows down. This slows down their vehicle allowing one girl to jump successfully.  The truck assumes that there was only one girl so he speeds back up. by the time the 2nd girl jumped it was full speed and she died on impact. 1st woman leaves body and her footstep are later scene leaving the body. Her boyfriend later finds out her secret. I watched this movie give or take 7-8 years ago.