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red light sensor with green light showing
Fei C
Fei C May 09, 2013
red light sensor with green light showing

I've seen these sensors...

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Similar Photos: A wireless network for sensing breath on patiences Electronic toll payment on highways and bridges.<br/>www.e-zpassny.com/‎ In Toronto we have 3D traffic sensors based on LED technology for managing traffic. It enables the system to precisely detect objects

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