When I came to America I found out that every place has a hitchhiking ghost story of some sort. Anyways, my local version goes something like this:
A teenage girl was returning home with her boyfriend after a long day. The day was overcast, and it was starting to rain. Now this girl lives up in the mountains. The roads up there are often poorly maintained, narrow and just plain dangerous. Many of them run right on the edges of cliffs. As you might have guessed, the couple drove off the road and down a sharp ravine. The boyfriend walked away, but the girl was not so lucky.
Whenever it is raining hard and dark on that same road, some people report picking up a girl standing by the patched up railing. They drive her home to her parents, and she disappears.