Emergency vehicle lighting is one or more visual warning lights fitted to a vehicle for use when the driver wishes to convey to other road users the urgency of their journey to provide additional warning of a hazard when stationary or in the case of law enforcement as a means of signalling another driver to stop for interaction with an officer.
Yellow flashing light on top of car.
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Green yellow amber and purple lights are also recognized emergency vehicle light colors in many states.
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The flashing or rotating amber lights may only be used when the vehicle is parked at the scene of an incident related to vehicular traffic.
Green lights are considered in many places as courtesy lights which means that the vehicle sporting that emergency vehicle light is requesting the right of way rather than demanding it.
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To obtain authorization and recognition of a vehicle that can be equipped with flashing or rotating amber lights step 1 filing an authorization application.
These lights may be dedicated emergency.
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In some cars it s just a warning light that is telling you it s time for scheduled service like oil replacement spark plug replacement etc.