Only started noticing this today. In every city I’ve ever lived in (east and west coast US), pedestrian walk signals have this triangular pattern grate over the actual lights that show the walk or wait imagery. Considering the panels use lights that are made to those actual shapes and not a pixelated display, what’s the purpose of the grate?
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When I lived in Missouri in the 90s, small birds would hang out in traffic lights at night.
My GF didn’t believe me until one night I showed her the bird’s silhouette.
This was before LED lights, so filament bulbs/incandescent lights were used. These give off heat, while the light is on. As it was a traffic light, it would cycle all night– probably a decently warm place in the winter time.
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