MUTCD 11th Edition (2023)
Section 2D.17 — ALTERNATE Auxiliary Plaques (M4-1P and M4-1aP)
Manual on Uniform Traffic Control Devices, Section 2D.17. Standards, guidance, options and support statements, with figures and cross-references.
Section 2D.17 ALTERNATE Auxiliary Plaques (M4-1P and M4-1aP) Option: 01 The ALTERNATE (M4-1P) or the ALT (M4-1aP) auxiliary plaque (see Figure 2D-5 ) may be used to indicate an officially designated alternate routing of a numbered route between two points on that route.Standard: 02 If used, the ALTERNATE or ALT auxiliary plaque shall be mounted directly above a route sign. 03 The M4-1P series plaques shall not be used to sign an alternative routing that is not officially designated and incorporated into the numbered highway system, such as alternative routings for incident management or…
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