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The traffic light, as we know it today, actually went through a few phases of invention.

1868 - JP Knight created a signal based on red and green gas lamps. It took an officer to operate it. It exploded about one month later and injured the officer on duty.

1912 - Lester Wire invented the first electric traffic light. It was also based off of the red and green system.

1914 - James Hoge improved upon the system by adding a buzzer to notify drivers that the light would soon be changing colors.

1920 - William Potts made a four way signal. Potts replaced the buzzer with a yellow light.

1923 - Garrett Morgan added a mechanical linkage to allow officers to operate the signal from a distance.

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When was the traffice light invented?

The first traffic light was invented in December 10, 1868. The electric traffic light was invented in 1912. The Automatic Traffic light was invented in 1927.


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What year is a traffic light invented?

1868


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Where was the electric traffic light invented?

london


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