I would like to learn more about the technique used when filming driving scenes back in the days before computers and greenscreens. Below are two screen captures from the film love and a '45 where they do this in a quite obvious and sort of ironic way.


First of all. what do you call the technique?
I assume you have to project the background film to a semi translucent screen or something.. Any info or links on how-to-do-it would be very much appreciated. particulary how-to's for a micro budget..
I also assume that there were people and companies back in the days and most likeley still are. That did the actual filming of background material, either outsourced for the particular film or collecting different sceneries, sort of like stock clips, that they then sold to the production. I am very interested in getting hold of some old clips of background material, preferably early 1970's. Any ideas as far as where I should start looking for this?
Also if you can't answer any of the above questions, but you can namedrop a movie which has a great driving scene, please post it. Or better yet upload the scene to youtube and post a link!
Thanks,
Steffen