Not sure I understand.
Are you stating to move the vendors from the gates of a town? I ask because you also state that the next area is not bad--but what comes after that is really bad. We shouldn't be "warning" about things two areas away...and I don't think we should be "warning" about things at all when it comes to town settings.
Now...with that said, in most areas we do try to warn about what is coming up (in some small way)...but that is hard to do in town settings--and we really shouldn't....especially if it is more than one area away.
Maybe I am not understanding your correctly here though.