MUTCD 11th Edition (2023)
Section 4E.01 — Signal Indications – Design, Illumination, Color, and Shape
Manual on Uniform Traffic Control Devices, Section 4E.01. Standards, guidance, options and support statements, with figures and cross-references.
Section 4E.01 Signal Indications – Design, Illumination, Color, and Shape Standard: 01 The illuminated part of each signal indication shall be circular or arrow, except those used for bicycle symbol signal indications, pedestrian signal heads, light rail transit signal indications, and lane-use control signals. 02 Letters or numbers (including those associated with countdown displays) shall not be displayed as part of a vehicular signal indication. 03 Strobes shall not be used within or adjacent to any signal indication. 04 Except for the flashing vehicular and pedestrian signal indications…
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