
One of the truly remarkable things about Tokyo is that it manages to be both the largest metropolitan area in the world and one of the most livable cities in the world. That's quite an accomplishment. And one of the key ingredients has to be its heavy reliance on rail for mobility. Look at any list of the busiest train stations in the world and you'll find that the majority of them are in Japan.
But what does this mean for the average person living in a city like Tokyo? Well, every 10 years Tokyo does a "person trip survey" that looks at how people get around. And if you look at the last set of results from 2018, you'll find the following modal splits:
33% railway
27% private car
23% walking
13% bicycle
4% other (bus and motorcycle)
This is a big deal. Supposedly this is the highest railway split in the world. But the numbers may be even better than this. According to a recent book by Daniel Knowles, who is a correspondent for The Economist, only about 12% of trips in Tokyo are done with a car, giving the city one of the lowest driving rates in the world. Bike usage is also higher than the above at 17%.
The 15-minute city is a popular topic these days. So here is a recent study that used GPS data from 40 million US mobile phones to estimate the percentage of consumption-related trips that actually adhere to this concept. The unsurprising result:
The overwhelming majority of Americans have never experienced anything resembling a 15-minute city. The median resident, we found, makes only 14% of their consumption trips within a 15-minute walking radius.
There is, of course, regional variation. For New York City, the data suggests that 42% of consumption-related trips occur within a 15-minute walking radius. Whereas in more sprawling cities like Atlanta, it's only 10% of trips. Again, this is not surprising. But it begs the question: What should we do?
The challenge is that 15-minute cities generally require built environments that are dense, conducive to walking, and filled with a concentration of different amenities. And this is more or less the opposite of the prototypical suburban model, where the car and single-use zoning tends to spread everything out.
The good news is that zoning is





