(a) Except as provided in paragraphs (b) through (e) of this section, this part is applicable to all segments designated as part of the Dwight D. Eisenhower National System of Interstate and Defense Highways (Interstate System) for which Federal-aid highway funds or other funds administered under title 23, United States Code, have been used in the past or are used to develop a project.

(b) This part is not applicable to ramps providing access to safety rest areas, information centers, weigh stations, and truck inspection stations located within the Interstate right-of-way when such areas are accessible to vehicles only to and from the Interstate System. Connections from other public facilities to facilities within the Interstate System right-of way, if an exception is granted in accordance with § 624.7(f), are subject to the requirements of this part.

(c) This part is not applicable to connections between managed lanes and general-purpose lanes on the same Interstate highway.

(d) This part is not applicable to State maintenance facilities that are located within the Interstate System right-of-way and not open to the public.

(e) This part is not applicable to access points to non-freeway Interstate System segments located in Alaska or Puerto Rico with average daily traffic volumes less than 400 vehicles per day. In such cases, the provisions of 23 U.S.C. 111 apply and the FHWA Division Administrator shall determine the level of analysis required to secure FHWA approval of the access modification.