Last weekend when Kiera and I went to my home town of Dunedin to visit my mother in hospital we visited Baldwin Street in North East Valley. This is the steepest street in the world. My late father grew up 'down the Valley' and had many great stories from the Depression one of which involving a car tyre being let go down a similar though not so steep street.
Here is Kiera leaning into the gradient.
Here is the info:
Walking up was one thing but coming down was something else. A fit young lady jogged DOWN the hill as we were going up.