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Rulebook › 49 CFR Part 390

§ 390.7 Rules of construction.

PART 390—FEDERAL MOTOR CARRIER SAFETY REGULATIONS; GENERAL, last amended 2018-06-15

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(a) In part 325 of subchapter A and in this subchapter, unless the context requires otherwise:

(1) Words imparting the singular include the plural;

(2) Words imparting the plural include the singular;

(3) Words imparting the present tense include the future tense.

(b) In this subchapter the word—

(1) Officer includes any person authorized by law to perform the duties of the office;

(2) Shall is used in an imperative sense;

(3) Must is used in an imperative sense;

(4) Should is used in a recommendatory sense;

(5) May is used in a permissive sense; and

(6) Includes is used as a word of inclusion, not limitation.

Official text from the eCFR. The eCFR is an authoritative but unofficial editorial compilation; the Federal Register is the legal source.