a design of a manually operated three-way traffic light with moving arms.

The control of traffic lights changed with the rise of computers in America in the 1950s. One of the best historical examples of computerised control of lights was in Denver, Colorado, in 1952. In 1967, Toronto, Canada, was the first to use more advanced computers better suited to vehicle detection. The computers maintained control over 159 signals in Toronto through telephone lines.

Vehicular signals

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