The Interstate Highway System of its day.
Eisenhower first became interested in building a nationwide system of military roads when he participated in the U.S. Army’s Cross-Country Motor Transport Train in 1919. Most roads then weren’t paved. They were so rough they shook the vehicles apart. Bridges were inadequate and military trucks crashed through them. There were barely any maps of the roads that did exist. The trip from Washington DC to San Francisco took 62 days.
Heh... yeah, strange how change has come (and in some cases, gone), and how quickly “the way things used to be” falls out of living memory.