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> The Alaska Highway, mentioned above, constructed across remote tundra, cost $793 per meter in 2019 dollars.

'the "highway" was not usable by general vehicles until 1943. Even then there were many steep grades, a poor surface, switchbacks to gain and descend hills ...' (https://en.wikipedia.org/wiki/Alaska_Highway#Construction) plus bridges which were temporary, impassable sections in 1943 when stuff started to melt, etc, etc ,etc.

A war-time dirt-road constructed by the army and only traversable by stuff that could probably go off-road anyway is not really the same as building something in an existing city which has to support regular bus traffic.

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