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In the air, cars can drive on a 3d axis, have no way to see road signs, and are more likely to fall on top of other cars if they're lucky enough not to get into
by WilliamEdward 8y ago
In the air, cars can drive on a 3d axis, have no way to see road signs, and are more likely to fall on top of other cars if they're lucky enough not to get into an accident with one already in the air.
Compare this to a tunnel, which has controlled routes, is out of the way of road-way cars, and if made properly will never collapse on itself. That's how.
- ummonk 8y agoElevated roadways would be far easier to build than tunnels.
- beobab 8y agoAlso, (and almost totally unrelated) Azimov predicted tunnels for autonomous vehicles in his Daneel Olivaw books. Mind you, he also predicted "rolling roadways", like a big conveyor belt instead of trains.
- samatman 8y agoThe Roads Must Roll was Heinlein. Asimov ran with it in Caves of Steel. But credit where credit is due.