Nothing deters the tanker driver, he will even destroy a gas station in order to kill David. David knows that no one is going to help him in the isolated desert. He has to kill or be killed...
This is a simple film, built around the duel between David and the unseen (apart from his arm) tanker driver. Quite why the tanker driver loses it is never explored and the story is both simple and ridiculous but the film really works.
One main reason is the abstract, and indeed pointless, nature of the menace makes it all the more sinister and dangerous.
