In Vancouver, they have blinking green lights. When the light initially turns green, it blinks. Then about 5 seconds before it turns yellow, the green goes to a solid green. It's meant to warn you that the yellow is coming up. I think it's to help prevent people from freaking out when the light turns yellow and speeding up to get through a light.

I kind of like it because you'll be about half a block from a light and it'll go to a solid green. You'll know to start slowing down before it's even turned yellow. If it didn't do this, you'd end up like 500 or 1000 feet from the light when it turns yellow, and then you have to make the decision to speed up or hit your brakes. The worst is when the guy behind you thinks you'll go through the light, and you don't.