[brett40324]

Not to be snarky, but the person to ask first about it's construction is Adolph Hitler, unfortunately. "Hitler's autobahn construction began in September 1933 under the direction of chief engineer Fritz Todt. The 14-mile expressway between Frankfurt and Darmstadt, which opened on May 19, 1935, was the first section completed under Hitler. By December 1941, when wartime needs brought construction to a halt, Germany had completed 2,400 miles (3,860 km), with another 1,550 miles (2,500 km) under construction."

Article link: https://www.fhwa.dot.gov/infrastructure/reichs.cfm