Over the time frame of a century , $18 M up front is a bargain .
The Autobahn has to be resurfaced every 40 years at a cost of $5.66 million per mile while the US Interstates have to be resurfaced every 20 years at a cost of $1.22 million per mile.
All costs provided are in current US dollars.
Give up the ghost ...
German Autobahn is a high quality roadway compared to the US roadways.
US roadways are considerable cheaper than German roadways.
If your point is quality then the Autobahn is much higher quality than US Interstates.
As an investment, UPS interstates are much, much cheaper per mile, especially over a century.
Note: You aren't arguing this time with a liberal driver who watches CNN to get their viewpoints.
I spent the last 30 years doing financial analysis based of the time value of money.