Steep Thrills
In the A-Z of Dunedin, New Zealand, Baldwin St looks unremarkable: quarter of a mile of straight suburban side-street, perpendicular to the main south road out of the city. Unfortunately the people planning it were in Britain -- 12,000 miles away -- and their maps weren't quite contoured up to OS standards. That main road ran along the bottom of a steep valley, and the side road, laid faithfully according to the plans, ran straight up a hillside. It resulted in Baldwin St being the steepest paved road in the world.
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Baldwin Street's monumental mapping error has given it a gradient of 1 in 2.66, or 38%.
http://i7.photobucket.com/albums/y26.../th_RABS2a.jpg
http://www.bikereader.com/contributo...ley/hills.html