Also, Montenegro's ONLY highway. They went into it despite experts knowing full well that the country couldn't afford one.

"Doubts about the highway surfaced after two feasibility studies, conducted in 2006 and 2012, showed it was not economically viable."

https://www.reuters.com/article/us-china-silkroad-europe-mon...

I can’t imagine building a highway on that terrain. I drove thru a lot of Montenegro and I haven’t seen any flatlands.

The country's name is literally "Black Mountain". There are tiny flatlands around the capital city and that's all.

You should check the A-8 Highway in northern Spain (paid with EU funds though)