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Motion sensors track crowd density at Canal Park in Washington D.C. and glows brighter when more people are present.
Brian S31
Brian S31 May 06, 2013
Motion sensors track crowd density at Canal Park in Washington D.C. and glows brighter when more people are present.

I've seen these sensors...

Often 3
Occasionally 2
Rarely 2
Never 4
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Similar Photos: In Paris, today.  DS 3D to guide you to visit the museum of Le Louvre with GPS and WI-FI. This would be really cool! I found it online, anyone ever heard of it? Places available sensors for underground parking gives users real-time information to optimize the time to park.<br/>Reus,Spain

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