Yeah, the extended green is a nasty problem. There's a light in our town that has an extended green for southbound. A couple of years ago, a northbound lady turned left, assuming the oncomming traffic had a red. Unfortunately, the oncoming traffic was a dump truck and from his perspective, he had a green light. She died.
Interesting that there are traffic lights with red on the bottom, must be old non-standard ones. I've noticed red is always at the top. I just figgured that since red was the most important light, they standardized with it at the top for best visibility(?)