an outstanding idea - the percentage of land (mis) use for roads is huge, even more so when you consider that on-surface roads also prevent vertical expansion.

an outstanding idea - the percentage of land (mis) use for roads is huge, even more so when you consider that on-surface roads also prevent vertical expansion. Turning roads into tunnels would free up all the space above it, for whatever we wanted to do - agriculture, solar energy, residential, leisure - or just leave it fallow and have nature retake it.