Has been well over a year, and I have talked about how much I go to Broken Arrow, where the things are very common. They are working well. We (family/friends) are all liking them a lot. Regularly get to go through a light where would be blocked otherwise. Next to the criss-cross intersections like they put into Norman city streets over I-35 a couple of years ago, this is second best innovation in traffic control in decades. Probably since right turn on red.
Huh, they aren't really associated with being more efficient for intersections. It is normally associated with reducing collisions. Though I guess if people are more alert during a flashing yellow than at a solid green circle than maybe they are able to take better advantage of breaks and also get into fewer accidents?