Robert Heinlein’s The Roads Must Roll takes place in a world where roads have been replaced by giant conveyor belts, operated by a quasi-military force. We discuss this and how Heinlein’s political view sometimes found their way into his stories.
Links:
The Roads Must Roll [Astounding June 1940]:
https://archive.org/details/Astounding_v25n04_1940-06_SLiV
X Minus One radio show, episode 32: “The Roads Must Roll” [1956]:
https://archive.org/details/xminusoneotr/X_Minus_One-The_Roads_Must_Roll.mp3
Citizen of the Galaxy by Robert A. Heinlein [1957]:
https://archive.org/details/trent_0116301748756