Our next stop was Lombard Street. Lombard Street is San Francisco-- and America's
crookedest street. It is famous for having a steep, one-block section that consists of tight hairpin turns.The switchback design was instituted in 1922 out of necessity to reduce the hill's natural 27° slope which was too steep for most vehicles to climb and a serious hazard to pedestrians used to a more reasonable sixteen-degree incline. The speed limit is a mere 5 mph (10 km/h) on the crooked section, which is about 1/4 mile (400 m) long.The crooked section of the street is reserved for one-way traffic traveling east (downhill), and is paved with bricks
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