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Yellow horizontal rectangle with black text reading EMERGENCY SIGNAL AHEAD on three lines.
MUTCD
W11-12P
Category
warning
Color
yellow
Shape
rectangle horizontal
National · MUTCD Sign Reference

Emergency Signal Ahead Plaque

Supplemental plaque warning of an emergency-vehicle traffic signal ahead.

A traffic signal ahead is activated by emergency vehicles leaving a fire or rescue station. When the signal is red, stop and stay stopped until it returns to green and the emergency vehicles have cleared. The plaque is mounted with a related warning sign or signal-ahead symbol.

In the same family

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Yellow diamond with black border containing a thick black arrow that travels up and bends ninety degrees to point left.
Turn Left
Yellow diamond with black border containing a thick black arrow that travels up and bends ninety degrees to point right.
Turn Right
Yellow diamond with black border containing a thick black arrow that sweeps in a smooth curve from lower right up to the upper left.
Curve Left
Yellow diamond with black border containing a thick black arrow that sweeps in a smooth curve from lower left up to the upper right.
Curve Right
Yellow diamond with black border showing a black curving arrow sweeping up and to the left, with the numerals 35 below it.
Curve Left With Advisory Speed
Source

Wikimedia Commons: File:MUTCD W11-12P.svg (Public domain)

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