Section 4G.03 Operation of Emergency-Vehicle Traffic Control Signals
01 Right-of-way for emergency vehicles at signalized locations operating in the steady (stop-and-go) mode
shall be obtained as provided in Section 4D.27.
02 As a minimum, the signal indications, sequence, and manner of operation of an emergency-vehicle
traffic control signal installed at a midblock location shall be as follows:
A. The signal indication, between emergency-vehicle actuations, shall be either green or flashing
yellow. If the flashing yellow signal indication is used instead of the green signal indication, it shall
be displayed in the normal position of the green signal indication, while the steady red and steady
yellow signal indications shall be displayed in their normal positions.
B. When an emergency-vehicle actuation occurs, a steady yellow change interval followed by a steady
red interval shall be displayed to traffic on the major street.
C. A yellow change interval is not required following the green interval for the
03 Emergency-vehicle traffic control signals located at intersections shall either be operated in the
flashing mode between emergency-vehicle actuations (see Sections 4D.28 and 4D.30) or be full-actuated
or semi-actuated to accommodate normal vehicular and pedestrian traffic on the streets.
04 Warning beacons, if used with an emergency-vehicle traffic control signal, shall be flashed only:
A. For an appropriate time in advance of and during the steady yellow change interval for the major
B. During the steady red interval for the major street.
05 The duration of the steady red interval for traffic on the major street should be determined by on-site test-run
time studies, but should not exceed 1.5 times the time required for the emergency vehicle to clear the path of
06 An emergency-vehicle traffic control signal sequence may be initiated manually from a local control point
such as a fire station or law enforcement headquarters or from an emergency vehicle equipped for remote
operation of the signal.
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