Eisenhower was also impressed by the Autobahn. The ease of movement it allowed trucks and such to move about into Germany and France as the Allies pushed inwards struck him as compared to how things were in the US.
Also wasnt he part of the first convoy to see how long it would take to get from DC to LA, then he got deployed and saw what you mentioned and decided it would be a great idea here?
The reason is because he wanted to evacuate cities when they got nuked, but that never happened so I guess we are stuck with these.
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