The Road Warrior. 
The Adventures of Priscilla, Queen of the Desert.
Dumb and Dumber has a road movie segment.
Two Lane Blacktop. No doubt. James Taylor, (yeah the singer) Dennis Wilson (yeah from the Beach Boys), Laurie Bird, and Warren Oates in a role that should have won him best supporting actor.
No one has names. Even at the end credits it’s the Driver, Mechanic, the Girl, the GTO.
Smokey and the Bandit
Endless Summer, 1 and 2
Hitler built the autobahn. Surely somebody filmed it. 
Bonnie and Clyde.
Vanishing Point (although this could also be classified as a car chase movie)
Lost In America
Fandango