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Vehicle detectors are imbedded in the pavement at the approach to the intersection and are used to activate and extend the green displays.
Maria Gabriela S
Maria Gabriela S May 06, 2013
Vehicle detectors are imbedded in the pavement at the approach to the intersection and are used to activate and extend the green displays.

I've seen these sensors...

Often 6
Occasionally 2
Rarely 2
Never 4
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