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According to the Guinness Book of Records, the world's steepest street is Baldwin Street in Dunedin, North East Valley, New Zealand. Baldwin Street is almost 350 meters (1150 feet) long and has a grade of 35%.
When determining the measurement of slope on a road, the equations are for grade (gradient). The formula is grade = (rise ÷ slope length) * 100
A two percent road grade is a grade where the road rises 2 units for every 100 units travelled.100 feet horizontal travel, will result in a two foot gain in elevation. It is a relatively shallow gradient.
Y=5x-2
The area with the steepest slope is the area where the contour lines are bunched closest together.