>>1028014I dunno, it's just those huge stretches of what looks like densely populated cityscape which get no coverage by the system at all.
Compare that to Hamburg (1.8 million people), which has a fully grade-separated metro of 105 km length that covers all boroughs of the city north of the river Elbe. In addition, they have an S-Bahn (commuter rail) and a shitton of buses with their own right-of-way.