MUTCD 11th Edition (2023)
Section 2D.09 — Numbered Highway Systems
Manual on Uniform Traffic Control Devices, Section 2D.09. Standards, guidance, options and support statements, with figures and cross-references.
Section 2D.09 Numbered Highway Systems Support: 01 The purpose of numbering and signing highway systems is to identify routes and facilitate travel. 02 The Interstate and United States (U.S.) highway systems are numbered by the American Association of State Highway and Transportation Officials (AASHTO) upon recommendations of the State highway organizations because the respective States own these systems. State and county road systems are numbered by the appropriate authorities. 03 The basic policy for numbering the Interstate and U.S. highway systems is contained in the following Purpose and…
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