[Riley]

That was 'Duel'. I agree on the ending- I particularly appreciated that we were spared the ubiquitous Hollywood gasoline fireball.

[toldyou]

Thanks so much. I just googled it, which is what I should have done in the first place:

1971 Made TV-movie debut, "Duel", directed by Stephen Spielberg


What's amazing, is that it certainly holds your interest, and he is really the only character in it!