What caused the termination of the initial London traffic signal experiment?

Answer

An explosion due to a gas line malfunction

The experiment in London ended tragically in early January 1869 when one of the gas lines failed, causing the signal to explode and injuring the officer operating it.

What caused the termination of the initial London traffic signal experiment?

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Invention of the traffic light by Garrett Morgan was in Cleveland in 1923

inventionHistorySignaltraffictraffic light