It looks like you get 18.7 miles for the Thorofare area if you look at the boundaries of the wilderness area, not roads. For OSM data, specifically, the area is

It looks like you get 18.7 miles for the Thorofare area if you look at the boundaries of the wilderness area, not roads. For OSM data, specifically, the area is bigger than that: 21.7 miles. If yall want to play yourselves: http://notes.secretsauce.net/notes/2017/09/25_pole-of-road-inaccessibility-of-the-contiguous-us.html http://notes.secretsauce.net/notes/2017/09/25_pole-of-road-i... and for more fun: http://notes.secretsauce.net/notes/2015/05/06_poles-of-inaccessibility-in-the-san-gabriel-mountains.html http://notes.secretsauce.net/notes/2015/05/06_poles-of-inacc...