I think this is a great idea. But, maybe better for a super train than a highway for standard vehicles. There are so many great ideas in the works for trains. Even trains which seem impossible to derail and have accidents. All run faster and work with various green fuel ideas.
I’d love to take a trip on a train from London to Toronto. No doubt the tracks could connect to Toronto somewhere along the way through western Canada or around the Great Lakes. What a great trip that would be.
Travel to Europe might become much more affordable too. Shipping of goods/ trade could be simpler. Not all of those trains would be for passengers!
Far into the future (or not so far) the road or train could extend south into Africa and South America too. How great would that be for developing countries? I’m not thinking tourism or charity but real human resources as people could make the trip in much less time – quite a distance to commute to work but the super trains could make the trip.