49 CFR § 372.243 - Controlling distances and population data.
---
identifier: "/us/cfr/t49/s372.243"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "49 CFR § 372.243 - Controlling distances and population data."
title_number: 49
title_name: "Transportation"
section_number: "372.243"
section_name: "Controlling distances and population data."
chapter_name: "FEDERAL MOTOR CARRIER SAFETY ADMINISTRATION, DEPARTMENT OF TRANSPORTATION"
subchapter_number: "B"
subchapter_name: "FEDERAL MOTOR CARRIER SAFETY REGULATIONS"
part_number: "372"
part_name: "EXEMPTIONS, COMMERCIAL ZONES, AND TERMINAL AREAS"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "49 U.S.C. 13504 and 13506; Pub. L. 105-178, sec. 4031, 112 Stat. 418; and 49 CFR 1.87."
cfr_part: "372"
---
# 372.243 Controlling distances and population data.
In the application of § 372.241:
(a) Air-line distances or mileages about corporate limits of municipalities shall be used.
(b) The population of any municipality shall be deemed to be the highest figure shown for that municipality in any decennial census since (and including) the 1940 decennial census.
(c) Contraction of municipal boundaries will not alter the size of commercial zones.
[32 FR 20040, Dec. 20, 1967, as amended at 37 FR 15701, Aug. 4, 1972; 50 FR 10233, Mar. 14, 1985; 62 FR 15422, Apr. 1, 1997]