Waipio Valley Rd
near Kukuihaele, Hawaii (United States)
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Itinerary description
A one-lane road with innumerable twists and turns. You need a 4-wheel drive to access. It is most likely one of the steepest roads in the world with a 25% grade for the entirety of less than one-mile. Do not even think about taking a 2-wheel drive.
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