When who and how traffic lights was found?

Question

When who and how traffic lights was found?

Answer 1

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.

With the coming of automobiles, the situation got even worse. Police Officer William L.  Potts of Detroit, Michigan, decided to do something about the problem.  What he had in mind was figuring out a way to adapt railroad signals for street use.  The railroads were already utilizing automatic controls. But railroad traffic traveled along parallel lines.  Street traffic traveled at right angles. Potts used red, amber, and green railroad lights and about thirty-seven dollars worth of wire and electrical controls to make the world’s first 4-way three color traffic light. It was installed in 1920 on the corner of Woodward and Michigan Avenues in Detroit. Within a year, Detroit had installed a total of fifteen of the new automatic lights.

At about the same time, Garrett Morgan of Cleveland, Ohio realized the need to control the flow of traffic. A gifted inventor and reportedly the first African American to own an automobile in Cleveland, Ohio, he invented the electric automatic traffic light. Though it looked more like the semaphore signals you see at train crossings today.

Milestones:

1918 U.S.Patent # 1,251,666 issued January 1, to J.B. Hoge of Cleveland, OH

1919 U.S.Patent # 1,307,544 issued June 24,  to Oscar A. Erdmann of Detroit, MI

1920 William Potts invents and installs a three color, four direction taffic light in Detroit, MI

1923 U.S.Patent # 1,475,024 issued November 20, 1923 to Garrett Morgan for traffic signal

ARYs: traffic light, traffic signal, stop light, William Potts, Garrett Morgan, J Hoge, Oscar Erdmann, history, invention, stroy, facts, biography, inventor............................

Answer 2

when?  today

who?  me

how?  i looked ahead while driving

found a few...

what kind of ridiculous nonsensical question is this?

speak english!

Answer 3

The traffic light, also known as traffic signal, stop light, traffic lamp, stop-and-go lights, robot or semaphore, is a signaling device positioned at a road intersection, pedestrian crossing, or other location. Its purpose is to indicate, using a series of colours (Red - Amber - Green) specific movement to drive, ride or walk - - each assigned the right-of-way at a given moment, using a universal colour code (and a precise sequence, for those who are colour blind).

The modern electric traffic light is an American invention.[

The design by James Hoge (USPTO # 1251666 Sept. 22, 1913) allowed Police and Fire stations to control the signals in case of emergency. The first four-way, three-colour traffic light was created by police officer William Potts in Detroit in 1920.[7] In 1923, Garrett Morgan patented a traffic signal device, although it was not a precursor of the modern traffic light [7].