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4 of 56: With the BART transit system on strike, traffic slows in the late morning commute getting to the San Francisco-Oakland Bay Bridge toll plaza Monday, Oct. 21, 2013, in Oakland, Calif. Frustrated San Francisco Bay Area commuters started the work week on Monday with gridlocked roadways and long lines for buses and ferries as a major transit strike entered its fourth day. (AP Photo/Eric Risberg)

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