This is a recent ruling by the US Court of Appeals for the ninth circuit in the case of DC Comics v. Mark Towle. Mark Towle supplied full size replica Batmobiles and also kits to make your car look like the Batmobile through his business, Garage Gotham.
DC Comics claimed that Mr Towle had infringed their copyright in the Batmobile as portrayed in the well known comics and television series. Holy copyright law, Batman! (to quote Judge Ikuta’s Opinion).
The court held that the Batmobile was a sufficiently distinctive element of the works (which are themselves protected by copyright) to qualify for copyright protection. The Opinion contains detailed discussion of the traits which help to qualify a character in a comic book or film for copyright protection under US law. Essential reading for Batman fans.