How to Avoid Car Crashes in the Fog


A multi-vehicle pileup on Interstate 75 near Gainesville, FL killed 10 people and sent 18 to the hospital last month. At least 12 cars and six tractor-trailer trucks were involved. The cause of the deadly accident was smoke-fog, a condition that common in Florida, where a combination of atmospheric conditions and frequent controlled burns create a thick, opaque super fog with zero visibility, even in broad daylight. A similar accident in 2008 took four lives and injured 38 on I-4 between Orlando and Tampa in 2008. But
deadly fog isn’t confined to the Sunshine State. Fog, which comes in many different forms, happens throughout the U.S., at various times of the year. Knowing the danger fog presents and the proper way to drive in can not only save money on car insurance, it can save your life.

There are over 6.3 million vehicle crashes every year according to National Highway Traffic Safety Administration (NHTSA) data. About 1.5 million are weather-related, and fog accounts for 38,000 of them (about 3%), annually killing about 600 people and injuring 15,600. Fog wreaks a lot of other havoc, too, by creating travel delays and increasing operating and maintenance costs on public roads.

Types of Fog

Radiation fog is formed when the heat absorbed by the earth during the day is radiated into space, usually after sunset. As the earth’s surface cools, it can create 100% humidity near the ground and a stationary
blanket of fog anywhere from 3 feet to 1,000 feet deep. Radiation fog is most prevalent in autumn and early winter.

Valley fog , a kind of radiation fog  common in the mountain valleys of eastern Kentucky and California’s Central Valley, where it’s often called tule fog, is most common during winter months. This type of fog tends to dissipate quickly once the sun rises and burns it off. At its thickest, visibility can be reduced to zero.

Advection fog forms when moist air blows over a cool surface and moves along the ground in a horizontal motion. It’s common along the Pacific Coast of North America, particularly at night, and during late fall and spring.  Upslope fogs happen during the winter months in all North American mountain ranges when light winds push moist air up mountains and hillsides, covering large areas of land. Frozen fog or ice fog happens when water droplets freeze into tiny ice crystals and hang suspended in mid-air. It’s often seen in urban areas when temperatures drop below -30 degrees and the exhaust from vehicles and power generators combine and freeze. It can be extremely thick and last for days until the temperature warms up.

Tips for Driving in Fog

  • The dumbest thing you can do in any kind of fog is to turn on your high beams – they’ll just bounce back at you further decreasing visibility. Instead, use your low beams or yellow fog lamps, if your car is equipped with them. You can increase your visibility to other drivers by
    turning on your 4-way flashers, too.
  • Go slow and don’t drive beyond your range of vision.
  • Increase the distance between you and the car ahead.
  • Use your windshield wipers and defrosters.
  • Turn off cruise control.
  • Roll down the window and turn down the radio so you can listen for traffic you can’t see.
  • Use the right side of the road and roadside reflectors as your guide.
  • If you can’t see at all, pull as far off the road as safely possible, leave your hazard flashers on and wait till conditions improve.
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