ANSWERS: 4
  • I don't know, American's think they invented everything! The world’s first traffic light came into being before the automobile was in use, and traffic consisted only of pedestrians, buggies, and wagons. Installed at an intersection in London in 1868, it was a revolving lantern with red and green signals. Red meant "stop" and green meant "caution." The lantern, illuminated by gas, was turned by means of a lever at its base so that the appropriate light faced traffic. On January 2, 1869, this crude traffic light exploded, injuring the policeman who was operating it. http://www.ideafinder.com/history/inventions/story010.htm Traffic Signals or Traffic Lights 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. Among the many early traffic signals or lights created the following are noted: Earnest Sirrine of Chicago, Illinois patented (976,939) perhaps the first automatic street traffic system in 1910. Sirrine's system used the non illuminated words "stop" and "proceed". Lester Wire of Salt Lake City, Utah invented (unpatented) an electric traffic light in 1912 that used red and green lights. James Hoge patented (1,251,666) manually controlled traffic lights in 1913, which were installed in Cleveland, Ohio a year later by the American Traffic Signal Company. Hoge's electric-powered lights used the illuminated words "stop" and "move". William Ghiglieri of San Francisco, California patented (1,224,632) perhaps the first automatic traffic signal using colored lights (red and green) in 1917. Ghiglieri's traffic signal had the option of being either manual or automatic. Around 1920, William Potts a Detroit policeman, invented (unpatented) several automatic electric traffic light systems including an overhanging four-way, red, green, and yellow light system. The first to use a yellow light. Garrett Morgan was issued a patent for an inexpensive to produce manual traffic signal in 1923. http://inventors.about.com/library/inventors/blasphalt.htm
  • Just look at this http://en.wikipedia.org/wiki/Garrett_Morgan their ur answer and yes he is black :]
  • If you mean Traffic Signals or Traffic Lights 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. Among the many early traffic signals or lights created the following are noted: Earnest Sirrine of Chicago, Illinois patented (976,939) perhaps the first automatic street traffic system in 1910. Sirrine's system used the non illuminated words "stop" and "proceed". Lester Wire of Salt Lake City, Utah invented (unpatented) an electric traffic light in 1912 that used red and green lights. James Hoge patented (1,251,666) manually controlled traffic lights in 1913, which were installed in Cleveland, Ohio a year later by the American Traffic Signal Company. Hoge's electric-powered lights used the illuminated words "stop" and "move". William Ghiglieri of San Francisco, California patented (1,224,632) perhaps the first automatic traffic signal using colored lights (red and green) in 1917. Ghiglieri's traffic signal had the option of being either manual or automatic. Around 1920, William Potts a Detroit policeman, invented (unpatented) several automatic electric traffic light systems including an overhanging four-way, red, green, and yellow light system. The first to use a yellow light. Garrett Morgan was issued a patent for an inexpensive to produce manual traffic signal in 1923.
  • U. Muststopsie.

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