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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: Arlington National Cemetery now has a great new way/ app for visitors - I tried this for the first time at the beginning of the year. Speed limit monitors use sensors to measure the speed of a vehicle that passes by it. Helps prevent speeding by reiterating your speed. not a sensor, but this app significantly improves the quality of life. You can plan your trip using every possible transport.

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