Ronin, Bullit, but on the Steve Mcqueen genre even though it wasn't a car chase, the motorcycle chase at the end of The Great Escape. Also, Smokey and the Bandit!
hmm Ronin, Bullit are good, but there is a little unknow car chase in a movie call "Duel" from Steven Spielberg. I think the way that chase was shot and done marks it as one of the best ever.