I originally saw this road movie at the Odeon Cinema, Elephant & Castle, in the 1970's. It carried a 15 Certificate, and I recall that I was underage at the time, and worried that I might get sussed out by the ticket seller. The Odeon isn't there any more, but I'm glad that I was able to track down a copy of the movie!!
Its story, if there ever was one, involved Barry Newman having to deliver a Dodge Challenger from Denver to San Fransico. That doesn't really matter. It was an adrenaline rush, involving Newman driving an American muscle car as fast as possible. From out of nowehere, some bloke decides he wants to test his E-Type Jag against Newman's Dodge - as you do - and it all ends in tears for the Jag driver.
Pursued by cops, the only thing they have on Newman is speeding and careless driving!! It's a great film to put the brain in neutral, sit back with a few munchies and a few beers, and drool over the deep rumbling sound of the Challenger's V8 power unit! It was the end of the flower power era. There is a great soundtrack of blues, folk and rock 'n' roll. Oh, and Gilda Texier riding a Harley in the desert.
I wonderful, whimsical movie, but at the end, the good guy can't win. It was the early '70's. A Cult Classic!!!