Section 29 - Portland, Oreg.

For the purpose of administration and enforcement of Part II of the Interstate Commerce Act, the zone adjacent to and commercially a part of Portland, Oreg., in which transportation by motor vehicle in interstate or foreign commerce, not under a common control, management, or arrangement for a continuous carriage or shipment to or from a point beyond the zone, will be partially exempt under section 203(b)(8) of the act (49 U.S.C. 303(b)(8)) from regulation, is hereby determined to include, and to be comprised of, the following:

(a) The municipality itself.

(b) All points in Oregon within a line drawn 5 miles beyond the corporate limits of Portland.

(c) All of any municipality any part of which is within the line described in (b) above.

(d) All of any municipality wholly surrounded, or so surrounded except for a water boundary, by the city of Portland or by any municipality included under the terms of (c) above.