23 CFR 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:
(b) AASHTO Guide to Metric Conversion.
(c) AASHTO Traffic Engineering Metric Conversion Factors.
(d) The standards required in this section are incorporated by reference into this section in accordance with 5 U.S.C. 552(a) and 1 1 CFR part 51. To enforce any edition other than that specified in this section, the FHWA must publish notice of change in the Federal Register and the material must be available to the public. All approved material is available for inspection at the Federal Highway Administration, Office of Transportation Operations, 1200 New Jersey Avenue SE., Washington, DC 20590, (202) 366-8043 and is available from the sources listed below. It is also available for inspection at the National Archives and Records Administration (NARA). For information on the availability of this material at NARA call (202) 741-6030, or go to http://www.archives.gov/federal-register/cfr/index.html.
(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), 2009 Edition, including Revisions No. 1 and No. 2, FHWA, dated May 2012.