What is the name of this movie? Only know the story.

Some friends driving on their car on a highway, young people(enjoying vacation maybe). Along the way, car breaks down. A guy on truck stops and tells them he will help them. Takes them to his place. Keeps them hostage and starts killing them. All got killed except one girl. She manages to escape in the night, the guy follows her, but she manages to reach the road the next morning. Movie ends, it says sth like, movie is based on a true story but and to date, the killer has stil not been found.