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Title 49: Transportation
Subtitle B: Other Regulations Relating to Transportation
CHAPTER I: PIPELINE AND HAZARDOUS MATERIALS SAFETY ADMINISTRATION, DEPARTMENT OF TRANSPORTATION
SUBCHAPTER C: HAZARDOUS MATERIALS REGULATIONS
PART 171: GENERAL INFORMATION, REGULATIONS, AND DEFINITIONS
Subpart A: Applicability, General Requirements, and North American Shipments
171.9 - Rules of construction.
(a) In this subchapter, unless the context requires otherwise:
(1) Words imparting the singular include the plural;
(2) Words imparting the plural include the singular; and
(3) Words imparting the masculine gender include the feminine;
(b) In this subchapter, the word: (1) ?Shall? is used in an imperative sense;
(2) ?Must? is used in an imperative sense;
(3) ?Should? is used in a recommendatory sense;
(4) ?May? is used in a permissive sense to state authority or permission to do the act described, and the words ?no person may * * *? or ?a person may not * * *? means that no person is required, authorized, or permitted to do the act described; and
(5) ?Includes? is used as a word of inclusion not limitation.
[Amdt. 171-32, 41 FR 15996, Apr. 15, 1976, as amended by Amdt. 171-32A, 41 FR 40630, Sept. 20, 1976; Amdt. 171-121, 58 FR 51528, Oct. 1, 1993; 75 FR 60338, Sept. 30, 2010]
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