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Which city had the first traffic light?

The first traffic light was erected on December 10, 1868, in London, England. It was placed on a 22-foot (6.7-meter) high cast-iron pillar at the corner of Bridge Street and New Palace Yard off Parliament Square. Invented by railway signaling engineer J. P. Knight, the light was a revolving gas lantern with red and green signals. It was turned by hand using a lever at the base of the pole.

An electric traffic signal was installed at Euclid Avenue and 105th Street in Cleveland, Ohio, on August 5, 1914. It had red and green lights. A warning buzzer was activated as the color changed.

Around 1913, Detroit, Michigan, used a system of manually operated semaphores (signal posts, like those used on railroads). Eventually the semaphores were fitted with colored lanterns for night traffic. New York City installed the first manually operated, three-color light signals in...

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1. Bridges And Tunnels
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   2. What are the various types of bridge structures?
   3. What is the world's longest bridge span?
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   6. Who designed the Golden Gate Bridge?
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   8. Who built the Brooklyn Bridge?
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   10. What is the world's longest rood tunnel?
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   3. How was early macadam different from modern paved roads?
   4. What is a jersey barrier?
   5. Which city had the first traffic light?
   6. Which state has the most miles of roads?
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