"let's make fast moving sidewalks high above the city streets. Or tram type of technology" This exists, sort of, in Hong Kong: https://en.wikipedia.org/wiki/C

"let's make fast moving sidewalks high above the city streets. Or tram type of technology" This exists, sort of, in Hong Kong: https://en.wikipedia.org/wiki/Central%E2%80%93Mid-Levels_escalator_and_walkway_system https://en.wikipedia.org/wiki/Central%E2%80%93Mid-Levels_esc... People literally commute to work via escalator.