StacksVerified U.S. regulatory reference

49 CFR §397.203

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
  1. (a)Any highway routing designation established, maintained, or enforced by a State, political subdivision thereof, or Indian tribe is preempted if—
    1. (1)Compliance with both the highway routing designation and any requirement under the Act or of a regulation issued under the Act is not possible;
    2. (2)The highway routing designation as applied or enforced creates an obstacle to the accomplishment and execution of the Act or the regulations issued under the Act; or
    3. (3)The highway routing designation is preempted pursuant to § 397.69(b) of this part.
  2. (b)[Reserved]