From Wikipedia "
The Batmobile is the automobile of DC Comics superhero Batman. The car has evolved along with the character from comic books to television and films. Kept in the Batcave, which it accesses through a hidden entrance, the Batmobile is a gadget-laden vehicle used by Batman in his crime-fighting activities.
Batman first drove in Detective Comics #27 (May, 1939). A sedan, the vehicle was simply referred to as "his car". It soon began featuring an increasingly prominent bat motif, typically including distinctive wing-shaped tailfins. In the early stages of Batman's career, he modified it with armor and technologically-advanced automotive customization and turned the Batmobile into a sleek street machine. The Batmobile has gone through numerous incarnations, and as state-of-the-art technology has continued to advance, the vehicle has had to change to stay a step ahead of real-life cutting edge advances.