When I went to school in the South, it was like, the first time you got a warning, and the second time you got bumped, pushed, or shoved out of the way. Some people honestly don't know, but a lot don't have the common sense or party etiquette to care. Sometimes, you basically have to be blind or severely bent to cut a stRHOll or train. The first time warning system always worked for us, back in the mid 90's.
TRSimon