We’ve already seen a number of trailers for director Walter Salles’ (The Motorcycle Diaries) adaptation of the Jack Kerouac novel On the Road, but the first official U.S. trailer has just now made its debut.  Kristen Stewart, Garrett Hedlund, and Sam Riley star as the central characters Marylou, Dean, and Sal, respectively, and this trailer is much more frenetic than what we’ve seen before.  It’s billed as a teaser trailer and thus is light on dialogue and heavy on fast cuts.  The film premiered earlier this year at the Cannes Film Festival where it received mixed reviews (read a round-up of the reactions right here), but Salles has apparently re-cut the film for its theatrical release.Hit the jump to watch the trailer.  The film also stars Viggo Mortensen, Kirsten Dunst, Amy Adams, and Elizabeth Moss.  On the Road will screen at the upcoming Toronto Film Festival and opens in U.S. theaters on December 21st.Click over to Yahoo! to watch in HD.

Here’s the synopsis for On the Road:

After the death of his father, Sal Paradise, an aspiring New York writer, meets Dean Moriarty, a wild and infectiously charismatic ex-con. They hit it off immediately. Determined to avoid the pitfalls of a narrow, prescribed life, Sal hits the road, joining Dean on what evolves into a life-changing physical and emotional odyssey. Thirsting for freedom, they discover the world, the ecstasy of experience, the connectedness of humanity and ultimately themselves.