Fog forms when tiny water droplets are suspended in the air.  Where visibility is reduced to less than 1,000 metres fog conditions exist (aviation fog threshold).  For driving or walking the visibility threshold is only 180 metres (thick fog).  When visibility is reduced to 50 metres or less (dense fog) there is a high impact on mobility and transportation based on the very narrow field of view.  If visibility is greater than 1,000 metres but still obscured, it is called mist.

Fogs are considered to be a hazardous weather environment that can cause danger to life and disruption of travel.  When encountering fog conditions, travelers must take extra care and be aware that travel through an affected area may take more time.  Despite the reduced visibility, travelers should only use reduced light as a higher, intense light will reflect of the water droplets and further reduce visibility.  This may seem counter-intuitive to the traveler.  


In addition, fog can make you feel as if you are moving more slowly than you actually are.  Given the extra time required for reaction to other travelers in these conditions, this illusion can prove fatal. Generally, insufficient care and attention to these conditions can cause injury up to and including death.

It is important when navigating in these conditions to reduce any distractions and pay mindful attention.  You may need to use your sense of hearing to compensate for reduced visibility to warn you of any dangers coming up ahead or behind of you.

[Information sourced at The Met Office (UK National Meteorological Office) and State Farm Insurance Tips on Driving Safely in Dense Fog]

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