In Germany, a km of Autobahn costs ~10M € which is around 16M €/mile [0]. An Autobahn built in/towards a city tend to get way more expensive. [0] https://www.

In Germany, a km of Autobahn costs ~10M € which is around 16M €/mile [0]. An Autobahn built in/towards a city tend to get way more expensive. [0] https://www.spiegel.de/wirtschaft/soziales/bundesregierung-plant-teuersten-autobahnabschnitt-aller-zeiten-a-1087460.html https://www.spiegel.de/wirtschaft/soziales/bundesregierung-p...