(a) Except as otherwise provided in this section, this part regulates the erection and maintenance of an outdoor sign along or near an expressway, only if:

(1) The sign is 660 feet or less from the nearest edge of the right-of-way of the expressway; or

(2) The sign is:

(i) More than 660 feet from the nearest edge of the right-of-way of the expressway;

(ii) Wholly or partly visible from the main traveled way of the expressway; and

(iii) Intended to be read from the main traveled way of the expressway.

(b) Except as provided in § 8-743 of this subtitle as to the removal of nonconforming signs, this part does not apply to:

(1) An outdoor sign that is 660 feet or less from the nearest edge of the right-of-way of an expressway, if the sign was erected on or before June 1, 1959; or

(2) An outdoor sign that is more than 660 feet from the nearest edge of the right-of-way of an expressway, if the sign was erected on or before July 1, 1975.