Although Jack Kerouac's “On the Road” has been praised as a milestone in American literature, this film version brings into question how much of a story it really offers. Kerouac's hero, Sal Paradise, becomes transfixed by the rambling outlaw vision of a charismatic car thief, Dean Moriarity, and joins him in a series of journeys from his mother's apartment in Ozone Park, N.Y., as they crisscross the continent to Chicago, Denver, San Francisco and then back again, until it occurs to Dean “I've never been south.” They turn to Mexico, finding in its long, straight cactus-lined roads, some secret to themselves. They also find marijuana; the two may not be unrelated.