The zone adjacent to, and commercially a part of El Paso, TX, within which transportation of passengers or property by motor carriers in interstate or foreign commerce, not under common control, management, or arrangement for a continuous carriage or shipment to or from a point beyond such zone, is partially exempt from regulation under 49 U.S.C. 13506(b)(1), includes and is comprised of all points as follows:

(a) The municipality of the City of El Paso, TX;

(b) All municipalities which are contiguous to the City of El Paso;

(c) All of any other municipalities and all unincorporated areas within the United States which are adjacent to the City of El Paso as follows:

(1) Within 15 miles of the corporate limits of the City of El Paso; or

(2) Within 15 miles of the corporate limits of the City of San Elizario, TX; and

(d) All municipalities wholly surrounded, or so surrounded except for a water boundary, by the City of El Paso, by any municipality contiguous thereto, or by any municipality adjacent thereto which is included in the commercial zone of the City of El Paso under the provisions of paragraph (c) of this section.