Roger this;There is a new traffic light for the colorblind that uses shapes instead of colors.

This new invention is called the Uni-Signal. It uses a red triangle as the stop light, a yellow circle for caution, and a green square for go. This way people who can’t tell the difference between the colors can remember the shapes that correspond to the different commands when driving. (Editor’s note: a friend with red-green colorblindness informed me that he keeps track by remembering that the top one means “stop”).