MUTCD 11th Edition (2023)
Section 4G.03 — Flashing Operation – Signal Indications during Flashing Mode
Manual on Uniform Traffic Control Devices, Section 4G.03. Standards, guidance, options and support statements, with figures and cross-references.
Section 4G.03 Flashing Operation – Signal Indications during Flashing Mode Guidance: 01 When a traffic control signal is operated in the flashing mode, a flashing yellow signal indication should be used for the major street and a flashing red signal indication should be used for the other approaches unless flashing red signal indications are used on all approaches. Standard: 02 When a traffic control signal is operated in the flashing mode, all of the green signal indications at the signalized location shall be dark (non-illuminated) and shall not be displayed in either a steady or flashing…
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