The cluster of public transit connections around Berlin (shown as dots and lines in light blue), its border stops (highlighted as red boxes), and the transfer patterns of optimal connections between border stops (thick black lines; only the most important 111 of 592 are shown to keep the image legible). This cuts out 96.15% of the network (especially a lot of the high-frequency inner city trips, which makes the time savings even bigger). Click here to view the full resolution image. [source: S. Storandt, 2016]