Okay so I'm not even sure how to describe this movie that well because I watched it when I was younger but I really want to find it.

Okay so this is how much I know. There's this girl I she was driving in a car something happens that causes the car to fly of this bridge so she becomes a ghost I believe it's a comedy 1980's or 1990's.

Possibly Susie Q (http://www.imdb.com/title/tt0117794/plotsummary).

Or possibly Beetle Juice (1988) (http://www.imdb.com/title/tt0094721/)