# 49 C.F.R. § 193.2009 (2026): Rules of regulatory construction

> Federal · Regulations · In force

URL: https://www.frixlaw.com/law-library/statutes/CFR_T49_P193_S193_2009

## Section

- **Citation:** 49 C.F.R. § 193.2009 (2026)
- **Heading:** Rules of regulatory construction
- **Jurisdiction:** Federal
- **Kind:** Regulations
- **Status:** In force
- **Text as of:** August 14, 2026
- **Source:** Compiled text
- **Location:** Title 49 CFR: Transportation / Chapter I / Part 193 / Subpart A / § 193.2009: § 193.2009   Rules of regulatory construction.

## Text

(a) As used in this part: (1) Includes means including but not limited to; (2) May means is permitted to or is authorized to; (3) May not means is not permitted to or is not authorized to; and (4) Shall or must is used in the mandatory and imperative sense. (b) In this part: (1) Words importing the singular include the plural; and (2) Words importing the plural include the singular.

## Nearby sections

- [49 C.F.R. § 193.2001 (2026) § 193.2001   Scope of part.](https://www.frixlaw.com/law-library/statutes/CFR_T49_P193_S193_2001.md)
- [49 C.F.R. § 193.2005 (2026) § 193.2005   Applicability.](https://www.frixlaw.com/law-library/statutes/CFR_T49_P193_S193_2005.md)
- [49 C.F.R. § 193.2007 (2026) § 193.2007   Definitions.](https://www.frixlaw.com/law-library/statutes/CFR_T49_P193_S193_2007.md)
- [49 C.F.R. § 193.2009 (2026) § 193.2009   Rules of regulatory construction.](https://www.frixlaw.com/law-library/statutes/CFR_T49_P193_S193_2009.md)
- [49 C.F.R. § 193.2011 (2026) § 193.2011   Reporting.](https://www.frixlaw.com/law-library/statutes/CFR_T49_P193_S193_2011.md)
- [49 C.F.R. § 193.2013 (2026) § 193.2013   What documents are incorporated by reference partly or wholly in this part?](https://www.frixlaw.com/law-library/statutes/CFR_T49_P193_S193_2013.md)
- [49 C.F.R. § 193.2017 (2026) § 193.2017   Plans and procedures.](https://www.frixlaw.com/law-library/statutes/CFR_T49_P193_S193_2017.md)
- [49 C.F.R. § 193.2019 (2026) § 193.2019   Mobile and temporary LNG facilities.](https://www.frixlaw.com/law-library/statutes/CFR_T49_P193_S193_2019.md)

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Source: Frix Law Library, https://www.frixlaw.com/law-library/statutes/CFR_T49_P193_S193_2009. Check the current official text before relying on it. Not legal advice.