I haven't used a car ferry in quite a while, but we had occasion to do just that this weekend while driving out to look at puppies. The dog breeder lives on Ryer Island which is accessible by either of two ferries or an out-of-the-way bridge. We took the larger ferry, dubbed "The Real McCoy". I kid you not. It has to cross quite a current despite the narrow path.
We did also drive past the other ferry, which is a cable ferry. Very neat.
An unexpected side-effect was hearing a new instruction from our TomTom John Cleese voice. We felt as if we'd heard all his instructions but this was new. Unfortunately, it was not quite as amusing as my personal favorite, "bear right, beaver left".