Here's the other version!
     A young woman is driving across the country and makes a stop before continuing. Later, she's driving down a dark and creepy road when an 18-wheeler (I think that's what it was) pulls up behind her, following her. Every now and again, he will switch on his high beams.
      This freaks the woman out especially since she's being followed and she gets so scared that when she sees a cop car on the side of the road, she pulls over to the shoulder to get their help. The 18-wheeler pulls over behind her.
      The woman jumps out and tells the cop what happened but as it turned out, the man in the 18-wheeler meant her no harm. The police opened her backdoor to reveal a man sitting in her backseat.
      As it turned out, the other man had seen the man in the lady's backseat and with no other way to warn her, would flash his high beams whenever the man rose up from the backseat to kill her. This man saved her life!