I am incredibly curious about the construction of America's highway system, but apparently nobody else on the entire internet is. Any article I find just says "they signed a bill which allocated money. Then they built roads." I would like to know any possible detail about the process of the highway system's development. I have a ton of questions and anything would be appreciated.

How much did the process cost? Where did we get all the asphalt for it, domestically or otherwise? How many workers were employed by the project? How long did it take? How much ground could a crew pave in a day considering modern construction of roads literally takes years? Did they start in the east and work their way west or did they simultaneously start work in numerous major cities? What were problems that arose as the roads were made? What were the results of building the road, did road deaths go down? Did car sales go up because of better roads?

Thank you for any details you guys can tell me. I know not all of the above questions have good answers.