Probably the most visited movie page here, so a couple of more vehicles...

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All from the diner scene, not the traffic in the beginning.

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First truck; 1965 International Harvester pickup. Second one; Mid-1950's Dodge. Third car; appears to be an early-1960's Rambler. Fourth car; 1961 Mercury Colony Park Station Wagon. Last one; Mid-1950's Cadillac(I thought it was a Packard at first, but I was wrong).

Blue sedan left of man facing camera and wearing a tie is a 57 Ford Fairlane (trim doesn't match 58).

The Cadillac is an early fifties Eldorado.

I stand corrected.

Done

http://www.imcdb.org/movie_67023-Duel.html

Done

Whoops, look like we did the same page simultaneously!