Just assume that you are taking the touristic route back home, in this case to Austin. At a curtain moment Marjan realises that she's being chased by this lunatic in his camper. She is driving a normal passenger car, he is driving a pretty big camper. Any driver in a similar situation would just accelerate to a speed fast enough to simply outrun the camper and seek for help at the nearest public stop. The road was narrow and had a lot of curves, easy to drive with a normal car, but pretty tricky for a heavy camper. But what Marjan does is slowing down and driving in the left lane and then apparently nearly hitting an other car. Also the response of the Police officer when he encounters the killer is not very professional, there was a warning out for several 911 calls and he did not check anything. Good for the story and ending, but not very realistic.
