I’m struggling with this average vs potential. If I stand on a 3.5m wide sidewalk on average I’m going to see 15,000 people pass me by? And there is no room for potential improvement as the sidewalks are completely full on average? And how are we figuring cars can potentially be improved by 33%? Are all cars 3/4ths full already?

I’m very pro public transit, I’m just unclear what is being shown in this chart.