Question: Why is it some days traffic on the freeway is very slow and other days it moves well in the same locations? 

Answer:  That's a question with a lot of possible answers!  Today (Columbus Day) I drove from Santa Clara County to Oakland.  The drive usually takes about 1 hour 15 minutes in the morning peak.  Today it was less than an hour.  Traffic was a little lighter than usual because a few folks get Columbus Day off but the big difference was on northbound I-880 between I-238 and I-9...
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