You just reminded me of a faux pas I committed years ago. Just after the Berlin Wall came down, I was delivering a load of building material to a part of what used to be East Berlin. No GPS in those days, so I was doing the old map-on-the-steering-wheel trick. I could see where I wanted to be, but couldn't figure out how to get there. I saw a cobblestone road that looked like it headed on the right direction so I turned into it, and immediately realized I was in trouble. It wasn't a road. It was a tramway. I was committed, so I continued down it, hoping not to meet a tram coming the other way. At the junction with a real road, there was a signal, but it had symbols rather than colored lights. I sat there for about 10 minutes trying to figure out which symbol meant I could proceed. Talk about dumb. I shouldn't even have been there and I was worried about running a "red" light.