The US Department of Transportation’s Federal Highway Administration (FHWA) has designated alternative fuel corridors, a national network of alternative fueling and charging infrastructure, along the National Highway System. Designation of the corridors began in 2016 and has expanded each year since then, for a total of more than 145,000 miles over 119 Interstates and 100 US highways/state roads (all fuels combined).
The fuels for which corridors have been designated include electricity, compressed natural gas (CNG), liquefied natural gas (LNG), propane (LPG), and hydrogen.
The FHWA has interactive maps showing corridors and pending corridors for each fuel. Examples: