§ 655.601 Purpose.

To prescribe the policies and procedures of the Federal Highway Administration (FHWA) to obtain basic uniformity of traffic control devices on all streets and highways in accordance with the following references that are approved by the FHWA for application on Federal-aid projects: (a) MUTCD. (b) AASHTO Guide to Metric Conversion. (c) AASHTO Traffic Engineering Metric Conversion Factors. (d) The material listed in this paragraph (a) of this section is incorporated by reference into this section with the approval of the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. To enforce any edition other than that specified in this section, the FHWA must publish a document in the Federal Register and the material must be available to the public. All approved material is available for inspection at the FHWA and at the National Archives and Records Administration (NARA). Contact Federal Highway Administration, Office of Transportation Operations, 1200 New Jersey Avenue SE, Washington, DC 20590, (202) 366-8043; https://ops.fhwa.dot.gov/contactus.htm. For information on the availability of this material at NARA, email: fr.inspection@nara.gov, or go to: www.archives.gov/federal-register/cfr/ibr-locations.html. The material may be obtained from the following source(s) in this paragraph (d). (1) AASHTO, American Association of State Highway and Transportation Officials, Suite 249, 444 North Capitol Street NW., Washington, DC 20001 (i) AASHTO Guide to Metric Conversion, 1993; (ii) AASHTO, Traffic Engineering Metric Conversion Factors, 1993—Addendum to the Guide to Metric Conversion, October 1993. (2) FHWA, Federal Highway Administration, 1200 New Jersey Avenue SE., Washington, DC 20590, telephone (202) 366-1993, also available at http://mutcd.fhwa.dot.gov. (i) Manual on Uniform Traffic Control Devices for Streets and Highways (MUTCD), 11th Edition, December 2023, with Revision 1 incorporated, FHWA, December 2025. (ii) [Reserved]