How do stop lights "see" your car (to turn green)?

Tyler wants to know how a traffic signal knows when to turn green -- when HE is the only driver on the road.

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In this video, I chat with two traffic signal experts: Mohammed Bendelhoum, an engineer with the California Dept. of Transportation (Caltrans) and Brian Girardo (Iteris) explore the history of vehicle detection (induction loops and video/camera detection) to explore which method is better.

Introduction: (0:00)
History of detection: (2:26)
Loops: (3:30)
Cameras: (7:20)
What about bicycles?: (11:23)
Conclusion: (13:53)

Видео How do stop lights "see" your car (to turn green)? канала Road Guy Rob