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However, visibility is often reduced somewhat by air pollution and high humidity. Various weather stations report this as haze (dry) or mist (moist). Fog and smoke can reduce visibility to near zero, making driving extremely dangerous. The same can happen in a sandstorm in and near desert areas, or with forest fires.
Traveling can be more difficult when going through clear areas and then encountering sudden patches of fog. It is important to reduce speed when visibility is limited and to use your headlights ...
Visibility can be measured in an arbitrary direction, and of various colour targets, but horizontal visibility of a black target reduces the variables and meets the requirements for a straight-forward and robust parameter for underwater visibility, which can be used to make operational decisions for mine hunters and explosive ordnance disposal ...
Smoke from a nearby brush fire combined with fog to reduce visibility to near zero. In 2014, a massive pileup in Florida, along I-75 south of Gainesville, caused the deaths of nearly a dozen ...
Whiteout or white-out [1] is a weather condition in which visibility and contrast are severely reduced by snow, fog, or sand. The horizon disappears from view while the sky and landscape appear featureless, leaving no points of visual reference by which to navigate.
Frigid conditions and gusty winds could elevate the risk for hypothermia, while times of rapidly reduced visibility in snow squalls can raise the risk of multi-vehicle pileups.
Blowing snow [1] is snow lifted from the surface by the wind, at eye level (1.8 m or 6 ft) or more, [2] that will reduce visibility. Blowing snow can come from falling snow or snow that already accumulated on the ground but is picked up and blown about by strong winds.
Driver height can also affect visibility. An A-pillar that is split up and has a small triangle window (Front Quarter glass) can give short driver visibility problems. In some cars, the windshield is fillet with the roof-line with a big radius. A fillet round A-pillar can give a tall driver visibility problems.