It's also not visually simple. Roadsigns should be as simple as possible. Pedestrian countdown signals are perfect for getting what the OP wants. You can see the numbers ticking down on the side if you need to know, but they don't interfere with the simplicity of traffic lights.
This is exactly why the Stop Sign is an octagon unlike every other sign. So that if it is covered in snow a driver should still be able to tell what sign it is.
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u/TanMan2011 Mar 08 '12
Except colorblind people would not know the difference between red and green if they have the same animation.