"Joy Ride" is directed by John Dahl, whose past contributions have included a top-grade B movie called "Red Rock West," about an unemployed guy played by Nicolas Cage who is mistaken for a contract killer and featuring Dennis Hopper in the role of a psycho who is the real hit man, "Lyle, from Dallas." Even better is Dahl's "The Last Seduction," with Linda Fiorentino as a sexy but pathological woman who dumps her husband, takes his drug-deal cash, and makes a local upstate guy her patsy. When put side by side with those beauties, "Joy Ride" is Dahl-disappointing, pretty conventional even if the villain is a truck rather than a human being, with the evil truck as the only thing this movie has in common with the vastly superior thriller, "Breakdown." Nor can Steve Zahn, admittedly a funny funny guy, or Paul Walker, perhaps the handsomest actor of his generation, match in acting ability Dahl favorites like Fiorentino, J.T. Walsh or Bill Pullman.

The comic antics come from Steve Zahn, who metamorphizes from a hell-raising good-time guy to one scared pup while the seriousness (and stick-like acting) comes from Walker, who as a guy completing freshman year in college is determined to change his platonic relationship with Venna (Leelee Sobieski) into something spicier. He leads her instead into the scariest adventure of her life as she is set up for cannon fodder by a truck driver (or rather by a truck--which is the only villain we can see), hoping to be rescued by her two companions in their vintage car with a vintage CB radio.

Dahl is better at staging a few scares than in making much out of Clay Tarver and J.J. Abrams' script. The highway used in Northern Nevada to stand in for Laramie, Wyoming and environs is a scary place of seedy, anonymous motels made especially hair-raising when photographed during a dark and stormy night.