BEECHVIEW: Pittsburgh's Canton Avenue is the steepest street in the United States.
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Hardknott Pass is considered to be one of the most challenging in the UK. It has earned this consideration due to its series of hairpin bends and the high risk of ice on the road. It is a steep, twisting, single-track road that cuts right through the heart of the Lake District between the Duddon Valley and Eskdale.
It features narrow parts and two 180 degree switch backs. At 25%, Porlock Hill is reputably the steepest A road in England. It's located west of the village of Porlock in Somerset. It climbs approximately 1,300 ft (400 m) in less than 2 miles (3.2 km) up onto Exmoor.