[marcosdumay]

I'm pretty sure the international agreement on road signaling completely forbids any stop and go light from being on the same place, so that you can distinguish them without depending on any color.

But well, the US never follows any agreement it signs, so yeah, that happens.

[bluGill]

Sure, but green is so washed out for me that the green position may not be there at all for all the good it goes. If you tell me the green is lit I'll look close and see it is on, but I will not notice without being told to look.