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Who invented the first traffic lights?

Garrett A. Morgan

Garrett A. Morgan

Garrett A. Morgan
Garrett Augustus Morgan, Sr., the inventor who invented a type of respiratory protective hood, credited with having a patent for a type of traffic signal, and invented a hair-straightening preparation
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Who is the inventor of (has invented) traffic lights (visual signals to control the flow of traffic at intersections)?

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In early 1922, African-American inventor Garrett Augustus Morgan designed a cross-shaped traffic signal, for which he submitted a patent application on February 27 of that year. The patent however — was not even among the first 50 traffic signal patents issued in the United States.

The FIRST known signal device for regulating street traffic was installed in 1868 in London, at the intersection of George and Bridge Streets near the Houses of Parliament. Designed by railroad signal engineer JP Knight, it had two semaphore arms which, when extended horizontally, meant "stop"; and when drooped at a 45-degree angle, meant "caution." At night, red and green gas lights accompanied the "stop" and "caution" positions (Sessions 1971; Mueller 1970).
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Posted at 6:07 on December 16, 2010.
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External web pages (using standard web search):

Who invented the traffic light?
Dear Yahoo!: Who invented the first traffic light? Ameenah Anderson, South Carolina : Dear Ameenah: We'd often heard Ohio boast of being home to the first traffic ...
http://ask.yahoo.com/20010914.html
Traffic lights in use before there were motorcars
Traffic lights were used before the advent of the motorcar. In 1868, British railroad signal engineer J P Knight invented the first traffic light, a lantern with red and green ...
http://didyouknow.org/trafficlights/
Traffic Light History - Invention of the Traffic Light
A gifted inventor and reportedly the first African American to own an automobile in Cleveland, Ohio, he invented the electric automatic traffic light.
http://www.ideafinder.com/history/inventions/trafficlight.htm
Who invented the first traffic light
Police Officer William L. Potts of Detroit, Michigan, decided to do something about the problem caused by the ever increasing number of automobiles on the streets.
http://wiki.answers.com/Q/Who_invented_the_first_traffic_light
Who Invented the Stoplight? | eHow.com
Who Invented the Stoplight?. Even before cars, towns needed a way to control traffic flow at intersections. The first traffic lights were installed in London near the House of ...
http://www.ehow.com/facts_4923292_who-invented-stoplight.html

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