IFC Films has unveiled the third trailer from On the Road, director Walter Salles' upcoming adaptation of the famed Jack Kerouac novel. Sam Riley and Garrett Hedlund star as Sal Paradise and Dean Moriarty, who hit the road with Dean's free-spirited girlfriend Marylou (Kristen Stewart) on a quest for their own version of freedom. Take a look at the latest footage from this road trip drama, arriving in New York and Los Angeles theaters December 21.