Thankfully, if there's enough room, you can repurpose roads into light / heavy rail when density increases enough.
Especially if the roads were laid out with foresight instead of organically tangling.
Especially if the roads were laid out with foresight instead of organically tangling.
I've seen those in films and on photos, yes, just not in person. So maybe it's not that common, really? Except when a million people need to flee from the latest flood in Bihar.