A great way to spend an afternoon. The genius of this film is in the familiar. Dennis Weaver is perfectly cast as the gangly, nerdy, traveling salesman. He's someone we already know. The other two stars of the film are a red Plymouth Valiant and a huge Tractor-trailer. The Plymouth is also a bit of casting genius: in 1971, those cars were very popular. A small, compact car, it would have been great for the traveling salesman who wanted something easy on gas. These cars were often-seen travelers at that time, and everybody either owned one or knew someone who did. Plymouth Valiants were not known for their speed and agility. (Unless you sprung for the V-8. That was somewhat faster, although, for you motor-heads, the displacement was similar to the V-6 in size, if I'm not mistaken). The truck, too, is a perfect player. It's an older model, even at that time, and it's massive styling and aging, dirty, rusty exterior adds to its presence. This film never leaves the roads of California, and soon, the highways of early-70's-California becomes Anywhere, USA.
Think of this movie as a spring, and the tension gets wound up tighter and tighter as we ride along with Dennis Weaver. Tension that is only broken by some unintentionally funny lines and acting from Weaver. But that doesn't in any way detract from the film, it only makes it more endearing. If you give this a fair viewing, you won't be able to tear yourself away from the screen, and by the time it's done, you may be afraid to drive across town.
This is an excellent film, and a fine way to spend an afternoon and I highly recommend it.