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The Cygnus displays a flashing red light on the port side of the vessel, a flashing green on the starboard side of the vessel, two flashing white lights on the top and one flashing yellow on the bottom side of the fuselage. [citation needed] The SpaceX Dragon and Dragon 2 spacecraft also feature a flashing strobe along with red and green lights.
The battery backups can operate the controller in emergency mode with the red light flashing or in fully functional mode. In 2004, California Energy Commission recommended to have local governments to convert their traffic lights to LEDs with battery backups.
A flashing red ball signal on a "protected" left turn traffic signal indicates that left turning traffic may, after a full stop, complete their turn if and only if there is a long enough break in oncoming traffic. The flashing red usually occurs when the oncoming traffic has a green signal.
The red light means that the vehicle facing the traffic light must come to a complete stop. A green light means that the vehicle facing the traffic light may proceed when it is safe to do so. A yellow light indicates that a red light will follow, and vehicle drivers must stop if it is safe to do so. Flashing beacons are flashing signals.
In New York City, a single flashing green light separated from the other red and blue flashing lights on an NYPD vehicle denotes it as a THV (Temporary Headquarters Vehicle) also known as a Mobile Command Post vehicle and also used on a 2-star Assistant Chiefs marked RMP (Radio Motor Patrol) vehicle to identify it as such.
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In Virginia, any member of a fire department, volunteer fire company, or volunteer emergency medical services agency and any police chaplain may equip one of their owned vehicles with no more than two flashing or steady-burning red – or red and white combination – warning light units, of types approved by the Superintendent of the State Police.
Cars in the US only have red tail lights, and no blue lights; a vehicle displaying a red (forward-facing) light (flashing or not) coming towards a driver, or from behind the driver (in rearview mirror) indicates that an official emergency vehicle is coming, requiring the driver to yield, pull off to the side of the road, or otherwise get out of ...