Emporia, Virginia is another notorious one, right on heavily traveled I-95 as well as US-58. Virginia has front license plates, so the cars that don’t have front plates definitely aren’t from Virginia and if there’s a group of cars all going the same speed it’s the easy way to pick out the non-local. Saw it happen when I was a passenger.

Thank you for giving the explanation so I didn’t have to (used to work in broadcast TV including sound and station engineer)