Movie.  (Maybe made-for-TV?) Saw it on TV in the early 80s.  It looked pretty recent at the time.

Three guys are traveling on the highways and they’re being pursued by bad guys.  Both sides have machine guns.  I think one of the good guys dies.  Eventually they make it to wherever they’re going, and their wives are waiting for them, and the wife of the guy who died sees he’s not there and cries.  That’s about all I got!