At some intersections the traffic signals have sensors to detect vehicles, and the traffic signal will only change if

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Biology

Gregory Campbell

13 September, 16:13

At some intersections the traffic signals have sensors to detect vehicles, and the traffic signal will only change if

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Christina Duarte · Answer 1

If a car has pulled up at the lights or there are cars idling waiting for the lights to change. The smart traffic lights use an inductor loop installed under the asphalt in the road next to the lights to detect cars. Some smart light use lasers for this detection.