This 1958 Fiat has been perched on this sign pole for over 40 years. It is an advertisement for Crist Termite and Pest Solutions. The car had been driven around to promote the business, and after its engine died, it was mounted on this sign pole.
In 2009, the car was taken down for a month to be restored.
http://virtualglobetrotting.com/map/car-on-a-signpole/
I also remember, about 10 years ago, seeing a rare 1970s Mazda on a pole at a scrapyard in Cookeville,Tn. I'll try to locate that but if you find it first, feel free to post it.