Edit: Not Pedestrian Crosswalk timers. Those are catered to pedestrians.
One of my friends recently went to China, and he told me about the road system there. One interesting note is that most of the traffic lights have timers.
When the light is red, the middle lamp will display a red countdown. When the light is green, the middle lamp will display a green countdown. The middle lamp will be yellow like normal when transitioning from green to red.
There's also a more graphical design. I don't think this is used anywhere yet, but it's a concept:
I think it's actually a pretty cool idea.
China, the Philippines and Thailand use timers on traffic signals pretty extensively. There's an older design, with a big obnoxious timer next to the light assembly.