(a)Any State or Indian tribe that establishes or modifies a highway routing designation over which NRHM may or may not be transported on or after November 14, 1994, and maintains or enforces such designation, shall comply with the highway routing standards set forth in § 397.71 of this subpart. For purposes of this subpart, any highway routing designation affecting the highway transportation of NRHM, made by a political subdivision of a State is considered as one made by that State, and all requirements of this subpart apply.
(b)Except as provided in §§ 397.75 and 397.219, an NRHM route designation made in violation of paragraph (a) of this section is preempted pursuant to 49 U.S.C. 5125(c).
(c)A highway routing designation established by a State, political subdivision, or Indian tribe before November 14, 1994 is subject to preemption in accordance with the preemption standards in paragraphs (a)(1) and (a)(2) of § 397.203.
(d)A State, political subdivision, or Indian tribe may petition for a waiver of preemption in accordance with § 397.213 of this part.