It's called a 'switchback'.
"Yeah! A switchback."
"There was one outside my school."
"Your school was on a cliff?"
"I guess? It was sort of on the side of a hill, but they'd cut away half the hill, for some reason, so the street on one side was like five stories higher then the street on the other side."
"Yeah I guess, I mean - I suppose they couldn't really build a school on the actual side of a hill, so they just flattened it."
"Did you play on this cliffside path?"
"No, we weren't allowed, I just walked up and down it afterschool. It had these cool sort of gardens on each of the landings."
"That sounds pretty, if perhaps a bit dangerous."
"It was, but I suppose I didn't really notice it much at the time - it was just the way I got to school. Anyway, one day, when I was on my way home, I fell."