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traffic red light sensor on the train rail
Fei C
Fei C May 09, 2013
traffic red light sensor on the train rail

I've seen these sensors...

Often 2
Occasionally 1
Rarely 1
Never 0
What is it? 1
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Similar Photos: An intelligent traffic light by using piezoelectric sensors Inteligent sempahores. We have at least 2 of them being tested on traffic jam avenues. They detect cars and can change before countdown ends Induction-loop traffic light sensors — it's like the pedestrian crossing button, but for cars. Minimizing idle time at traffic lights.

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