Fig. 7

Critical regions in the transit system. Figure created with R version 4.1.2 https://cran.r-project.org/bin/windows/base/old/4.1.2/, using leaflet 2.2.2 https://cran.r-project.org/package=leaflet. The base tile layer was downloaded from OpenStreetMap (CC BY-SA 2.0; https://www.openstreetmap.org/copyright).