Another winner, Bob. I can't count the number of shots I've made while my wife was driving. The Fed Ex truck in the mountains, which I've posted here in the past was, I think, the best of the bunch.
http://www.russ-lewis.com/photo_gallery/InPassing/content/Highway_West_large.html
My mom was an avid in-car snapper. Bob's pic reminds me of the attached one, taken in summer 1958. Not sure of the location. Kodak Retina camera (probably), slow Kodachrome.-Dave-