This guide is for general information only and is not legal advice. Laws change — verify current rules with your state DOT or a licensed attorney before relying on this for any legal matter. Read full disclaimer.
The rule
Bicycles are permitted on Interstate highways in Alaska. Alaska generally permits bicycle travel on the shoulders of state highways and Interstate-equivalent routes (the Glenn, Parks, Seward, and Richardson Highways) where no parallel alternative exists. Alaska DOT&PF posts site-specific 'No Bicycles' signs on bridges, tunnels, and certain urban segments around Anchorage; the on-ramp signage controls.
What this means in practice
Interstate cycling is legal in Alaska, but ride only where you have a wide, clean shoulder and exit at the first signed bicycle exit when conditions deteriorate.