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On Friday, Oct. 18, a sign on the Bay Bridge warns commuters to expect traffic because of no BART service. (Ellen Barkenbush/KQED)

On Friday, Oct. 18, a sign on the Bay Bridge warns commuters to expect traffic because of no BART service. (Ellen Barkenbush/KQED)

On Friday, Oct. 18, a sign on the Bay Bridge warns commuters to expect traffic because of no BART service. (Ellen Barkenbush/KQED)