How is this different then now? Game Moderators already will kick / ban you if you get rammed and you end up going part way through the intersection at a red light.
Also, if you are stopped at a green light and wait there because if you went through you would be stuck in the middle of the intersection (as the road in front of you is full) you also get kicked / banned because you are not obeying the traffic lights. (even though if you go through the green light you would just be stuck in the intersection creating a traffic gridlock.