Which signal is used to indicate special movement instructions for emergency vehicles at an intersection?
A flashing blue signal is used for emergency vehicles
Ordinary traffic signals use only three colours — red to stop, amber to caution and green to go — to control the general flow of vehicles at an intersection.
The governing idea is that a movement instruction reserved for emergency vehicles must use a colour set apart from those three ordinary phases, so it is not confused with normal traffic commands.
A flashing blue signal is the colour associated with emergency vehicles, marking their special right of movement through the intersection.
A flashing red signal means treat the junction like a stop sign — a general warning to halt — so it is not reserved for emergency movement.
A flashing yellow signal tells all drivers to slow and proceed with caution, again a general instruction rather than an emergency-vehicle one.
A flashing green is not a standard emergency reservation either; green simply conveys the ordinary permission to proceed.
Because blue is the colour set aside for responders' special movement, it is the correct signal.
Hence, the answer is A flashing blue signal is used for emergency vehicles.
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