Pittsburgh PA you run into similar things, but mostly related to turning left. There are far too few left turn lanes. So when a light turns green the unofficial rule is that you let one (*maybe *two) cars through to turn left before oncoming traffic goes straight, because some day, you will want to turn left and/or not be stuck behind a mile of traffic because one car can’t turn left at the front of the line. Traffic would be 100% worse if there was no Pittsburgh Left. You can always tell when someone is a recent arrival or not planning to stick around for very long because they either don’t know the rule or refuse to follow it.
Pittsburgh PA you run into similar things, but mostly related to turning left. There are far too few left turn lanes. So when a light turns green the unofficial rule is that you let one (*maybe *two) cars through to turn left before oncoming traffic goes straight, because some day, you will want to turn left and/or not be stuck behind a mile of traffic because one car can’t turn left at the front of the line. Traffic would be 100% worse if there was no Pittsburgh Left. You can always tell when someone is a recent arrival or not planning to stick around for very long because they either don’t know the rule or refuse to follow it.