In this case, a couple (Kurt Russell & Kathleen Quinlan) break down (hence the title) in the wrong place at the wrong time. Specifically the New Mexico desert. A good samaritan (a.k.a. "the bad guy") truck driver (the late J.T. Walsh) stops to help them out. So the husband stays with the car and lets his wife go for help with the truck driver (way to protect the missus, dimwit). What could possibly go wrong? Naturally she ends up missing. It's all a big frantic search after that that could've been avoided by either a.) waiting for the police, or b.) telling the wife to stay with the car and going off with the trucker yourself. Duh. And apparently the guy who kidnapped her is none other than Jigsaw from the Saw movie franchise! (Listen closely during the trailer)
And in keeping with the travel theme...