49 C.F.R. § 172.503 Identification number display on placards.
Title 49 - Transportation
For procedures and limitations pertaining to the display of identification numbers on placards, see §172.334. [Amdt. 172–58, 45 FR 34701, May 22, 1980]
Title 49: Transportation
PART 172—HAZARDOUS MATERIALS TABLE, SPECIAL PROVISIONS, HAZARDOUS MATERIALS COMMUNICATIONS, EMERGENCY RESPONSE INFORMATION, AND TRAINING REQUIREMENTS
Subpart F—Placarding
§ 172.503 Identification number display on placards.