MUTCD 11th Edition (2023)
Section 4G.01 — Flashing Operation of Traffic Control Signals – General
Manual on Uniform Traffic Control Devices, Section 4G.01. Standards, guidance, options and support statements, with figures and cross-references.
Section 4G.01 Flashing Operation of Traffic Control Signals – General Standard: 01 The light source of a flashing signal indication shall be flashed continuously at a rate of not less than 50 or more than 60 times per minute. 02 The displayed period of each flash shall be a minimum of ½ and a maximum of ²⁄³ of the total flash cycle. 03 Flashing signal indications shall comply with the requirements of other Sections of this Manual regarding visibility limiting or positioning of conflicting signal indications, except that flashing yellow signal indications for through traffic shall not be…
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