Nationwide bicycle laws set the floor for safe roads, but they don’t govern day‑to‑day traffic offenses. The Manual on Uniform Traffic Control Devices (MUTCD) standardizes bicycle signs, lane markings, and signals. The National Highway Traffic Safety Administration (NHTSA) and the Federal Highway Administration (FHWA) issue safety recommendations on separation, visibility, and speed management.
Federal bike accident rules shape how evidence is evaluated after a crash (e.g., whether markings and warnings met national standards). However, they don’t override state codes on right‑of‑way, passing distances, or helmets — these are the areas of key US bike crash legal differences.