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All was seemingly normal during Thanksgiving on the San Francisco Bay Bridge, the Golden Gate's more utilitarian sister that connects roughly 300,000 drivers daily from the city to Oakland. But at around 12:30 p.m., one car suddenly slowed to a standstill in the left lane, causing an eight-vehicle pileup that left nine people injured, including a 2-year-old child, and blocked traffic on the bridge for over an hour.

So what happened?

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Source Fool.com