Communication via signage is based on function and purpose. The traffic signal is a good example of how a single color communicates without further explanation. When people cross a street they press the button on the traffic signal column. Then, the signal turns red to green in the crosswalk as the signal for the drivers turn green to red. In this case the human shape in the crosswalk signal is quite unnecessary because the effect is not the form but the color. A way to improve the efficiency of the form, the green light should show a human shape actually walking and the red light should show the shape stopping. In addition, since the signal lights on streets already implement a form of animation, blinking, adding simple motion to the existing system is not far from present practice.
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