According to theGuinness Book of World Records, the steepest residential road in the world is Dunedan, New Zealand’sBaldwin Street, which boasts an average grade of 35%—though Pittsburgh has contested that its Canton Avenue has an average grade of 37%. How does San Francisco stack up? Gra...
The record is measured based on the steepest (highest gradient) section over a 10 m distance. If the average steepness is taken, you could have a road where one section is extremely steep and the rest is flat, which is not a fair assessment. The gradient is measured by taking the...