Although fog is not a terribly great threat, man has still come up with ingenious devices to help lessen its danger. For example, radio beacons and markers have been developed, especially for aircraft and sea-going vessels, which allows them to travel even in foggy weather.

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Forces of Nature: ThinkQuest 2000 (Team #C003603)

http://library.thinkquest.org/C003603/english/fogandmist/preparation.shtml