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Traffic Light By kodey

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lis lab3

on 10 April 2013

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Transcript of Traffic Light By kodey

The Traffic Light was
invented before cars J P knight
invented the
traffic light The End Traffic Light Older incandescent traffic light bulbs typically used 175 watt bulbs. New LED traffic lights use only around 10-25 watts. In the early police officer manned traffic control systems, police officers often used red for stop and green for go, but rather than have a yellow light, they simply blew a whistle to indicate that they were about to change the signal. In the U.S. and some other countries, modern traffic signal lights are either 8 or 12 inches in diameter and must be visible in every kind of weather and lighting condition The world's first traffic lights were installed near London's House of Commons (intersection of George and Bridge Streets) in 1868. They were invented by J P Knight.
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