MUTCD 11th Edition (2023)
Section 4E.02 — Size of Vehicular Signal Indications
Manual on Uniform Traffic Control Devices, Section 4E.02. Standards, guidance, options and support statements, with figures and cross-references.
Section 4E.02 Size of Vehicular Signal Indications Standard: 01 There shall be three nominal diameter sizes for vehicular signal indications: 4 inches, 8 inches, and 12 inches. 02 Four-inch signal indications shall only be used for bicycle signal faces per Section 4H.07. 03 Twelve-inch signal indications shall be used for all arrow signal indications. 04 Except as provided in Paragraph 5 of this Section, 12-inch signal indications shall be used for all circular signal indications in all new signal faces. Option: 05 Eight-inch circular signal indications may be used in new signal faces only…
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