How were the earliest automatic traffic lights automated?

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In 1910 Ernest Sirrine had patented an automated street-traffic system that used a motor and a set of gears and pulleys to rotate signs attached to an axis.

... The cam 13 is driven at a constant speed and at a rate to suit the estimated proper speed of street traffic, and is of such a nature as to operate the arms 11 at proper intervals, this operation of these arms being simultaneous as they are linked at 16. Each time the arms 11 are operated both arms 7 and 8 are rotated about their fixed horizontal axes, whereby one arm displays one signal and the other arm displays and opposite signal each time the arms are rotated.

From that description, I guess you could say the first automated traffic light system used a mechanical timer, not synchronized with other traffic lights, but displaying opposite signals on both sides.

vadkou 201

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How were the earliest automatic traffic lights automated?

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