In Meteorology, ability is a measure of the nothingness at which an object or light can be seen. It is important to all forms of traffic: roads, sailing and aviation. Meteorological visibility refers to fog of air: in bright, rological ability is still the same in the air daylight.
For aviation, visibility is defined as the greater of: Satellite image of Hurricane Hugo with a polar low visible at the top of the image. ... For the mathematics of nothing, see zero. ... Aviation refers to flying using aircraft, machines designed by humans for atmospheric flight. ...

a) the greatest distance at which a black object of suitable dimensions, situated near the ground, can be seen and recognized when observed against a bright background;

b) the greatest distance at which lights in the vicinity of 1,000 candelas can be seen and identified against an unlit background.

In aviation another term, Runway Visual Range (RVR) is also defined. Runway Visual Range (RVR) is an aeronautical term essentially meaning the visibility distance on the runway of an airport. ...

Foggy morning road

on clear days, Tel Aviv's skyline is visible from the Carmel mountains, 80km north

In extremely clean air in Arctic or mountainous areas, the visibility can be up to 70 to 100 km. However, visibility is often reduced somewhat by air pollution and high humidity. Various weather stations report this as haze (dry) or ist (moist). Fog and moke can duce visibi zero, making driving exts. happen in a sandstorm in and near sert areas, or with rest ires. Heavy in (such as from a understorm) not only causes low visibility, but the inability to brake quickly due to laning. lizzards and ground blizzards (blowing snow) are also defined in part by low visibility. Image File history File linksMetadata Size of this preview: 800 × 600 pixel Image in higher resolution (1024 × 768 pixel, file size: 119 KB, MIME type: image/jpeg) Description Fog on a road, illustrating decreasing visibility Date 2005-8-1 Author Phyzome is Tim McCormack File links The following pages on... Image File history File linksMetadata Size of this preview: 800 × 600 pixel Image in higher resolution (1024 × 768 pixel, file size: 119 KB, MIME type: image/jpeg) Description Fog on a road, illustrating decreasing visibility Date 2005-8-1 Author Phyzome is Tim McCormack File links The following pages on... Image File history File linksMetadata Download high-resolution version (2246x411, 156 KB) Tel Avivs skyline from ~80km north in the Carmel mountains Beivushtang 15:35, 28 November 2006 (UTC) http://www. ... Image File history File linksMetadata Download high-resolution version (2246x411, 156 KB) Tel Avivs skyline from ~80km north in the Carmel mountains Beivushtang 15:35, 28 November 2006 (UTC) http://www. ... Before flue gas desulfurization was installed, the emissions from this power plant in New Mexico contained excessive amounts of sulfur dioxide. ... Humidity is the concentration of water vapor in the air. ... A technician examines a weather stations anemometer. ... Severe haze affecting Ampang, Kuala Lumpur, Malaysia in August 2005 Moon over red and blue haze For other uses, see Haze (disambiguation). ... Wikipedia does not have an article with this exact name. ... Evening fog obscures Londons Tower Bridge from passers by. ... Moke (colloquial in British English for donkey) is the shortened name for the Mini Moke, an open car based on the Austin Mini, designed by Sir Alec Issigonis. ... Driving is the controlled operation of a vehicle, which is usually a motor vehicle such as a truck, bus, or car. ... Sandstorm can refer to: Sandstorms, a term used for dust storms in the desert. ... The Special Emergency Response Team (SERT) was the RCMP counter-terrorism unit which existed until 1993. ... IN or in may stand for: India ISO country code Indiana state code Indium In symbol for the chemical element Intelligent network a telecommunications architecture Car designation for Ingolstadt Inch In Nomine Look up IN in Wiktionary, the free dictionary This is a disambiguation page — a navigational aid which lists... A brake is a device for slowing or stopping the motion of a machine or vehicle, and to keep it from starting to move again. ...

Low-visibility conditions are generally one mile or 1600 meters or less. Visibility of less than 100 meters or ¹/16^th of a mile are usually reported as zero. In these conditions, roads may be closed, or automatic warning lights and signs may be activated to warn drivers. These have been put in place in certain areas that are prone to repeatedly low visibility, particularly after massive pile-up accidents involving collisions of several (or even dozens) of automobiles have occurred there. This article or section does not cite its references or sources. ... A multi-vehicle collision (colloquially known as a pile-up) is a road traffic accident involving many vehicles. ... A car accident in Yate, near Bristol, England, in July 2004. ... For other uses, see Collision (disambiguation). ... Dozen is another word for the number twelve. ... Karl Benzs Velo (vélo means bicycle in French) model (1894) - entered into the first automobile race 2005 MINI Cooper S. An automobile (also motor car or simply car) is a wheeled passenger vehicle that carries its own motor. ...

Visibility is measured by scattering of light. Either some light is transmitted, and the device measures how much is received a distance away, or the scattered portion is measured directly.