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In page Grade (slope):
"The steepest roads in the world are Baldwin Street in Dunedin, New Zealand, Ffordd Pen Llech in Harlech, Wales[2] and Canton Avenue in Pittsburgh, Pennsylvania.[3] The Guinness World Record lists Ffordd Pen Llech as the steepest street in the world, with a 37.45% grade (1 in 2.67 slope UK). The Pittsburgh Department of Engineering and Construction recorded a grade of 37% (20°) for Canton Avenue.[4] The street has formed part of a bicycle race since 1983.[5]
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