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Only emergency and police vehicle may use blue lights. This includes firefighters, rescue services, emergency response vehicles for public utilities and civil defense units. All other kinds of blue lights (e.g. car floor lighting or cab interior lights), including reflective stickers or paintings, are illegal on public roads. [38]
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 ...
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.).
An Incident Response Unit operated by Norfolk Fire and Rescue Service with a blue lightbar on top, alternately flashing LED lights on the front, and flashing headlights. This vehicle is part of the New Dimension programme and consequently does not carry any insignia of Norfolk Fire and Rescue Service.
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 ...
This means the ADB capabilities engineered into headlights already on Audi and Mercedes cars in the US, for instance, will probably never get switched on. Vision versus glare.
New vehicles are increasingly taller, making oncoming headlights more likely to be eye-level for drivers in small cars. And few states annually check for headlight misalignment, which can lift ...
Audi showed the Audi Nuvolari concept car with LED headlights in 2003. [118] [119] [120] Automotive headlamp applications using light-emitting diodes (LEDs) have been undergoing development since 2004. [121] [122] In 2004, Audi released the first car with LED daytime running lights and directionals, the 2004 Audi A8 W12. [123] [124]