Ask X3What does 49 CFR 397.203 (Standards for determining preemption) require?
Generated guidance. Confirm the source and its applicability before you act. How we check sources.
Based on 49 CFR 397.203, a highway routing designation established, maintained, or enforced by a State, political subdivision, or Indian tribe is preempted if:
1. It is impossible to comply with both the routing designation and any requirement under the Act or its regulations;
2. The routing designation, as applied or enforced, creates an obstacle to accomplishing and executing the Act or its regulations; or
3. The routing designation is preempted pursuant to § 397.69(b).