Traffic lights for the color blind

From Autoblog Uni-signal Traffic light with shapes for the color blind.
The principle seems right, the symbols seem wrong. Red should be an octagon, to align with the stop sign. If we use LEDs we could actually spell out the word “stop” (though this might have trouble in winter). An idea worth playing with.

Commuting-When is it worth it? | Ask MetaFilter

Forwarded by my favorite Mefite Commuting-When is it worth it? | Ask MetaFilter, an interesting thread on when is commuting 1 hour (each way) worth it.