Transportation: America's 10 Worst Cities

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No.10: San Francisco, Calif. San Francisco's biggest traffic problems are the result of bottlenecks. Due in large part to the city's geography, traffic gets nipped by bridges which force all traffic to a handful of pressure points, because they're the only ways to get in and out. Between mass transit, subways, street cars, trolleys, ferries, carpooling and walking, 28% of metro residents avoid single-driver commuting, the third best rate in the nation, but the delays of 60 hours a year (the second worst, behind Los Angeles) and the high rate of commuters spending an hour or more en route (10.5%) really slow things down.

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