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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 ...
Headlight flashing is the act of either briefly switching on the headlights of a car, or of momentarily switching between a headlight's high beams and low beams, in an effort to communicate with another driver or drivers. The signal is sometimes referred to in car manufacturers' manuals as an optical horn, since it draws the attention of other ...
If a blue flashing light is seen in either traffic or the sea, other vehicles must yield to let that vehicle pass. Blue flashing lights are used by police, military police, customs, fire departments, rescue services, and ambulances. Government, VIP, and embassy vehicles may also use blue if accompanied by local police.
NWAS ambulance displays the operation of a wig-wag: only one headlight operates at a time, with the two flashing alternately at a preset rate. A wig-wag is a device for flashing an automobile's headlamps, in its simplest form, so only one of the two headlights operates at a time, with the two flashing at a preset rate. In its traditional form a ...
Category for lights found on automobiles and motor vehicles, and features of them common to all types of vehicles. It applies to headlamps and side indicators. It applies to headlamps and side indicators.
They have been increasingly rare since the 1950s, as ever-stricter legislation has prescribed the need for the modern type of flashing signal. Many historic vehicles (e.g. pre-1960 Volkswagen Beetle ) that are used on today's roads have had their trafficators supplemented or replaced with modern indicators to aid visibility and to meet ...
The use of flashing lights and sirens is colloquially known as blues and twos, which refers to the blue lights and the two-tone siren once commonplace (although most sirens now use a range of tones). In the UK, only blue lights are used to denote emergency vehicles (although other colours may be used as sidelights, stop indicators, etc.).
These warning signs indicate that traffic lights are ahead, and are often used when it is difficult to see that a traffic light may already be showing red, to warn a driver to prepare to slow down. They may be supplemented with flashing light or lighted sign when light is red or turning red.