Monaghan plays a wild-living haulier forced to confront her past in the film, which co-stars Nathan Fillion and Benjamin Bratt.
She was forced to undergo extensive driving lessons for the role, and admits she fell in love with the life of a long-distance trucker.
Monaghan tells the New York Daily News, "I went to truck school and I got my permit. I was one of the greatest challenges I ever put myself up against. It was empowering and exciting to be on the open road flying down all the freeways with my 53-foot 18 wheeler."