One of the interesting things about the Hong Kong system is that unlike many places with this pedway system, the terrain gets quite steep quite quickly, and so

One of the interesting things about the Hong Kong system is that unlike many places with this pedway system, the terrain gets quite steep quite quickly, and so using the pedway systems may result in the same or fewer level changes than using the street network. Hong Kong has one of the few examples of a public transport system consisting entirely of escalators. https://en.wikipedia.org/wiki/Central%E2%80%93Mid-Levels_escalator https://en.wikipedia.org/wiki/Central%E2%80%93Mid-Levels_esc...