This confuses me and I want answers. Ok, so every time me and my mom are on the highway. We come to one of those tunnels. They have a big yellow sign over them that says something like "if lights are blinking tunnel is closed." That makes absolutely no sense. I'm almost certain that if anyone is close enough to see these signs, you're definitely in a car.... on your way THROUGH that tunnel. So say I'm riding on the highway one day.. and that sign just so happens to be blinking.. Now what?