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Speed limit monitors use sensors to measure the speed of a vehicle that passes by it. Helps prevent speeding by reiterating your speed.
Victoria D3
Victoria D3 May 08, 2013
Speed limit monitors use sensors to measure the speed of a vehicle that passes by it. Helps prevent speeding by reiterating your speed.

I've seen these sensors...

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Similar Photos: Gate of University library which requires student's ID card to get in. This gate has sensor that react to ID card. traffic detection by means of video analysis 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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