MUTCD 11th Edition (2023)
Section 4F.18 — Preemption and Priority Control of Traffic Control Signals – General
Manual on Uniform Traffic Control Devices, Section 4F.18. Standards, guidance, options and support statements, with figures and cross-references.
Section 4F.18 Preemption and Priority Control of Traffic Control Signals – General Option: 01 Traffic control signals may be designed and operated to respond to certain classes of approaching vehicles by altering the normal signal timing and phasing plan(s) during the approach and passage of those vehicles. The alternative plan(s) may be as simple as extending a currently displayed green interval or as complex as replacing the entire set of signal phases and timing. Support: 02 Some types or classes of vehicles supersede others when a traffic control signal responds to more than one type or…
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