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highlight part of traffic light
Fei C
Fei C May 09, 2013
highlight part of traffic light

I've seen these sensors...

Often 0
Occasionally 1
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Never 1
What is it? 2
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Similar Photos: Heliostats, basically smart mirrors, rotate to reflect sunlight toward a predetermined target, like the area between high rise buildings. Lytro Camera Lets You Focus Photos After You Take Them. One of the most common sensor, it's a motion sensor. Commonly used for automatic doors.

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