Does anyone know the name of this movie.....?

A young woman is driving home from work and she runs over an older fellow. He is critically injured and she panics and puts him in the boot of her car, thinking that he will be dead by morning. She finds him still alive and badly injured so keeps him trapped in the car in her garage. Most of the movie is his attempts to free himself (quite bloody). She asks her black boyfriend to help dispose of him, but some of the neighbours kids realise he is in there and call for help.