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micro almost invisible traffic sensor
Fei C
Fei C May 09, 2013
micro almost invisible traffic sensor

I've seen these sensors...

Often 2
Occasionally 0
Rarely 0
Never 2
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Similar Photos: Nest is a learning home thermostat that learns/senses when you are home and the heating needs of your house based on outside temperature. I think these are at every airport now in the states. the most popular taxi app in China. In this case both driver and client's smartphone act as a sensors exchanging information to eachother.

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