49 U.S.C. § 31504 — Identification of motor vehicles

1. (a)General AuthorityThe Secretary of Transportation may—
   1. (1)issue and require the display of an identification plate on a motor vehicle used in transportation provided by a motor private carrier and a motor carrier of migrant workers subject to section 31502(c) of this title, except a motor contract carrier; and
   2. (2)require each of those motor private carriers and motor carriers of migrant workers to pay the reasonable cost of the plate.
2. (b)LimitationA motor private carrier or a motor carrier of migrant workers may use an identification plate only as authorized by the Secretary.