Question:  How do the traffic reporters get the current information on freeway congestion for their reports?  

Answer:  There are a few different sources.  The main one is detectors in the pavement that constantly measure speed and send the data to a Traffic Management Center.  In the SF Bay Area Caltrans has a Regional Traffic Management Center in their headquarters building in Oakland.   http://transportationnation.org/2012/04/26/decoding-the-mysteries-of-bay-area-traffic/tmc-main-pc/ 

 The d...
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