Active visual warnings

Main article: Emergency vehicle lighting

An ambulance in Denmark with roof-integrated LED lights, plus side-view mirror, grill and front fend-off lights, and fog lamps wig-wags
The active visual warnings are usually in the form of flashing lights. These flash in order to attract the attention of other road users as the ambulance approaches, or to provide warning to motorists approaching a stopped ambulance in a dangerous position on the road. Common colours for ambulance warning beacons are blue, red, amber, and white (clear). However the colours may vary by country and sometimes by operator.
Emergency lights may be housed in special fittings, such as in a lightbar, or may be hidden in a host light (such as a headlamp) by drilling a hole in the host light's reflector and inserting the emergency light. These hidden lights may not be apparent until they are activated. Additionally, some of the standard lights fitted to an ambulance (e.g. headlamps, tail lamps) may be programed to flash. Flashing headlights (typically the high beams, flashed alternately) are known as a wig-wag.
There are several technologies in use to achieve the flashing effect. These incluse flashing a light bulb or LED, and strobe lights, which are usually brighter than incandescent lights. Each of these can be programed to flash singly or in groups, and can be programmed to flash in patterns (such as a left -> right pattern for use when the ambulance is parked on the left hand side of the road, indicating to other road users that they should move to the right (away from the ambulance). Incandescent and LED lights may also be programed to burn steadily, without flashing.
In order to increase safety, it is best practice to have 360° coverage with the active warnings, improving the chance of the vehicle being seen from all sides. In some countries, such as the United States, this may be mandatory.
See also Emergency vehicle equipment.

911signal Strobe light, Police lighting system

A strobe light or stroboscopic lamp, commonly called a strobe, is a device used to produce regular flashes of light.

A typical commercial strobe light has a flash energy in the region of 10 to 150 joules , and discharge times as short as a few milliseconds, often resulting in a flash power of several kilowatts .

The strobe light was popularized on the club scene during the 1960s when it was used to reproduce and enhance the effects of LSD trips. Ken Kesey used strobe lighting in coordination with the music of the Grateful Dead during his legendary Acid Tests.

Special calibrated strobe lights, capable of flashing up to hundreds of times per second, are used in industry to “stop” the motion of rotating and other repetitively-operating machinery and to measure, or adjust, the rotation speeds or cycle times.

Strobe lighting can trigger seizures in photosensitive epilepsy .

Since this stop is only apparent, a marked point on the rotating body will either appear to move backward or forward, or not move, depending on the frequency of the strobe-flash.

Police Warning lights

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Emergency vehicle equipment

Passive visual warnings

The passive visual warnings are usually inherently linked to the design of the vehicle, and involve the use of high contrast patterns. Older vehicles (and those in developing countries) are more likely to have their pattern painted on, whereas modern vehicles generally carry the retro-reflective designs which reflect light from car headlights or torches (and was invented by 3M). Popular patterns include 'checker board' (alternate coloured squares, sometimes called 'Battenburg markings'), chevrons (arrowheads - often pointed towards the front of the vehicle if on the side, or pointing vertically upwards on the rear) or stripes (along the side - these were the first type or retro-reflective device introduced, as the original 3M reflective material only came in tape form). In some countries, in addition to retro-reflective markings, the vehicles are now painted in a bright yellow or orange colour underneath, in order to maximise visual impact.

Another passive marking form is the name of the emergency service spelled out in reverse on the front of the vehicle (e.g. Ambulance or Fire). This enables drivers of other vehicles to more easily identify an approaching emergency vehicle in their rear view mirrors. The vehicle may also display the name of their owner or operator, and a telephone number which may be used to summon the vehicle.

Many ambulances use the Star of Life, which indicates that the vehicle's operators can render their given level of care represented on the six pointed star.

Ambulances may also carry an emblem (either as part of the passive warning markings or not). Some ambulances may display a Red Cross, Red Crescent or Red Diamond (collective known as theProtective Symbols). These are symbols laid down by the Geneva Conventions, and all countries signatory to it agree to restrict their use to either (1) Military Ambulances or (2) the national Red Cross or Red Crescent society. Use by any other person, organisation or agency is in breach of international law. The protective symbols are designed to indicate to all people (especially combatants in the case of war) that the vehicle is neutral and is not to be fired upon (seeMilitary ambulances), hence giving protection to the medics and their casualties, although this has not always been adhered to.

Emergency vehicle lighting

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