32 General

321 U.S. Department of Transportation

DOT regulates the carriage of hazardous materials within the U.S. under the Code of Federal Regulations Title 49 (49 CFR). These regulations provide detailed specifications for packaging, marking, and labeling hazardous materials. 49 CFR also exempts or establishes other requirements for limited quantities and small quantities of hazardous materials. Postal Service mailing standards for hazardous materials generally adhere to 49 CFR, but also include many additional limitations and prohibitions.