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Interstate System Access - 23 CFR 624 (Part 624)

The Dwight D. Eisenhower National System of Interstate and Defense Highways (Interstate System) is a critical element of the surface transportation system, providing a network of limited access freeways which facilitate the distribution of virtually all goods and services across the United States. The Interstate System also influences the mobility and safety of people and goods by providing access to local highways and networks of public streets. As a result, it is in the national interest to preserve and enhance the Interstate System to meet the needs of the surface transportation system of the United States for the 21st Century.

Part 624 provides the requirements for the justification and documentation necessary to substantiate any proposed changes in access to the Interstate System. This regulation also facilitates decision-making regarding proposed changes in access to the Interstate System in a manner that considers and is consistent with the vision, goals, and long-range transportation plans of a metropolitan area, region, and State. All new or modified points of access must be approved by FHWA and developed in accordance with federal laws and regulations (as specified in 23 U.S.C. 109 and 111, 23 CFR 624 and 625.4, 23 CFR 1.32, and 49 CFR 1.85). The complete text of this regulation and the previous policies may be viewed at the following links:

Updated: 03/28/2025
Federal Highway Administration | 1200 New Jersey Avenue, SE | Washington, DC 20590 | 202-366-4000