Traffic lights today are controlled by computers and other purpose-built systems, but what did people do before computers ...
Morning Overview on MSN
The clever way traffic lights worked before computers
Before the advent of computers, traffic lights were a marvel of mechanical and electromechanical engineering, utilizing ...
Q: What are the rules about crosswalks at intersections with signal lights? Many people think that if they are in a crosswalk and the light is green for the automobile, they can still cross. Please ...
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