Every map on this site is drawn the same way: a person who knows the way walks it once, and the walk becomes the map. This page is all of them, city by city.

A corridor with minutes in navy has been walked with the recorder; that number is measured. A corridor with a tilde is an estimate, waiting for its walk. Nothing here pretends to be measured when it is not.

The walking times marked with a tilde are estimates until a surveyor walks that corridor with the recorder. Estimates are drawn from the sheets; measured minutes replace them automatically. New cities join this page the day their first corridor is opened.