> One point this article misses is the size of the cities. Until mid-1800 cities were at most 1-1.5 km long, usually just 2-3 streets.
See perhaps:
> Marchetti's constant is the average time spent by a person for commuting each day. Its value is approximately one hour, or half an hour for a one-way trip. It is named after Italian physicist Cesare Marchetti, though Marchetti himself attributed the "one hour" finding to transportation analyst and engineer Yacov Zahavi.[1]
See perhaps:
> Marchetti's constant is the average time spent by a person for commuting each day. Its value is approximately one hour, or half an hour for a one-way trip. It is named after Italian physicist Cesare Marchetti, though Marchetti himself attributed the "one hour" finding to transportation analyst and engineer Yacov Zahavi.[1]
* https://en.wikipedia.org/wiki/Marchetti%27s_constant
* https://archive.is/edypl / https://www.bloomberg.com/news/features/2019-08-29/the-commu...