The US can use federal highways to rapidly move soldiers.

[The National Highway System] NHS consists of five parts…

…The fourth component is major Strategic Highway Corridor Network connectors. They consist of more than 3,000 km of roads linking major military installations and other defense-related facilities to the STRAHNET corridors.

Source: https://web.archive.org/web/20141216112008/http://www.fhwa.dot.gov/publications/publicroads/96spring/p96sp2.cfm