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  • § 171.1
    Applicability of Hazardous Materials Regulations (HMR) to persons and functions
  • § 171.2
    General requirements
  • § 171.3
    Hazardous waste
  • § 171.4
    Marine pollutants
  • § 171.6
    Control numbers under the Paperwork Reduction Act
  • § 171.7
    Reference material
  • § 171.8
    Definitions and abbreviations
  • § 171.9
    Rules of construction
  • § 171.10
    Units of measure
  • § 171.12
    North American Shipments
  • § 171.15
    Immediate notice of certain hazardous materials incidents
  • § 171.16
    Detailed hazardous materials incident reports
  • § 171.22
    Authorization and conditions for the use of international standards and regulations
  • § 171.23
    Requirements for specific materials and packagings transported under the ICAO Technical Instructions, IMDG Code, Transport Canada TDG Regulations, or the IAEA Regulations
  • § 171.24
    Additional requirements for the use of the ICAO Technical Instructions
  • § 171.25
    Additional requirements for the use of the IMDG Code
  • § 171.26
    Additional requirements for the use of the IAEA Regulations


Section § 171.9: Rules of construction

Below are the available interpretations for the given section. To return to the list of parts, use the Parts link above. The menu to the left provides a full list of sections that have interpretations. To view interpretations for a different section, click on the menu item.

The regulations text of the section can be found on the eCFR website. To view the regulations text, use the link below. For assistance, please send an email to
View regulations for Part 171

Ref ID Date Company Name Individual Name Response Document
10-0036 12-02-2010 Dangerous Goods Declaration, Inc., and DGD Transport, Inc. Mr. Luis Lopez View
CHI-09-001 11-04-2009 Wal-Mart Stores, Inc. Thomas E. Evans View