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Hey Area: Why do so many Bay Area highways end in the number 80?

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"Tassajara Road at 580, Dublin, March 22, 2008," by Flickr user Michael Patrick. Used under CC BY-NC-ND 2.0. Cropped.

Why do so many Bay Area highways have similar names? We've got Interstate 280, 580, 680 and 880 — what gives? That's the question that listener Jennifer Paulus submitted to Hey Area, KALW's collaborative reporting project. Click the player above for the answer. 

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