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BTCL Tower in dhaka
Md A
Md A May 06, 2013
BTCL Tower in dhaka

I've seen these sensors...

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Similar Photos: Sensor imbedded in the pavement. The sensor picks up changes in the magnetic field from cars. The information is used for traffic modeling. Treadmills have both a speed sensor and heart rate control sensor. Pedestrians to cross the road, they will touch the switch. With minutes/seconds the censors given green to the walk way and red to others.

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