23 CFR § 657.3 - Definitions.

---
identifier: "/us/cfr/t23/s657.3"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "23 CFR § 657.3 - Definitions."
title_number: 23
title_name: "Highways"
section_number: "657.3"
section_name: "Definitions."
chapter_name: "FEDERAL HIGHWAY ADMINISTRATION, DEPARTMENT OF TRANSPORTATION"
subchapter_number: "G"
subchapter_name: "ENGINEERING AND TRAFFIC OPERATIONS"
part_number: "657"
part_name: "CERTIFICATION OF SIZE AND WEIGHT ENFORCEMENT"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "23 U.S.C. 127, 141 and 315; 49 U.S.C. 31111, 31113 and 31114; sec. 1023, Pub. L. 102-240, 105 Stat. 1914; and 49 CFR 1.48(b)(19), (b)(23), (c)(1) and (c)(19)."
regulatory_source: "45 FR 52368, Aug. 7, 1980; 62 FR 62261, Nov. 21, 1997, unless otherwise noted."
cfr_part: "657"
---


# 657.3 Definitions.

Unless otherwise specified in this part, the definitions in 23 U.S.C. 101(a) are applicable to this part. As used in this part:

*Enforcing* or *Enforcement* means all actions by the State to obtain compliance with size and weight requirements by all vehicles operating on the Interstate System and those roads which, prior to October 1, 1991, were designated as part of the Federal-aid Primary, Federal-aid Secondary, or Federal-aid Urban Systems.

*Urbanized area* means an area with a population of 50,000 or more.

[72 FR 7747, Feb. 20, 2007]