An Airplane style disaster farce about a nuclear powered bus that has to travel non-stop from New York to Denver. Fearing a world of Nuclear (Petrol Free) busses, Oil Companies conspire to make the bus' first journey it's last.

The (fictional) bus in question was a giant articulated vehicle. Much of the aft section contained the reactor, and some space age jet thrusters. It required two pilots to drive it, however unlike a regular bus, it's commanders could control just about everything - from the roof flags of the world to the fizzy drink dispensers in the rear.

IMDB have a good review of the movie http://us.imdb.com/Title?0074205