Without banging anyone over the head about the origins of the TV Batmobile, it was originally a Lincoln Futura showcar built in 1955; when the show came along, George Barris had the car in his possession, and had the vehicle "Bat-Kustomized" (don't know if that's an actual word, just came to me). Three more fibreglass Batmobiles were built from molds taken from the original Batmobile: one was a backup car for the show, and two more were built as 427-powered dragsters for the racing car circuit (along with a copy of the Black Beauty). The fifth car was fan-built and was later obtained by Barris. Despite claims to the contrary by people hustling to sell their knock-offs, there was never a sixth Batmobile.
There are full-size Batmobiles out there for the taking (if you have some big bucks laying around), either in kit car form or built-up customs using T-Birds or LTDs for running chassis, but from what I understand, none would be street-legal anywhere in the continental U. S.