Road Weather Management Program
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Low Visibility

An image showing snow blowing accross the road.

Visibility distance is reduced by fog and heavy precipitation, as well as wind-blown snow, dust and smoke. Low visibility conditions cause increased speed variance, which increases crash risk. Each year, over 38,700 vehicle crashes occur in fog. Over 600 people are killed and more than 16,300 people are injured in these crashes annually.

National Highway Visibility Web Site - Sponsored by the FHWA Highway Community Exchange (HCX) program, this web site provides a forum for discussions on the topic of weather conditions that affect visibility, especially fog.


To view publications related to low visibility, please select one of the following key words.

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