Must increase the cost of the projects, surely.
It’s not like we are not in enough debt already
Immensely.
If you aren't familiar with the huge cost and the mega cost over-runs on the Boston underground highway called the BIG-DIG just do a search.
These kinds of projects are like a perpetual motion machine fueled by taxpayer dollars.
Labor Unions and contractors make financial contributions to politicians.
Politicians reward them with projects like this.
How often do we see crews making roadways wider to add more lanes on ground level highways?
What happens when these underground highways need to be widened?