I-55

City officials are urging drivers to use extreme caution when driving in the vicinity of the fire, particularly in the morning and evening hours, when fog is most likely. The National Weather Service has issued a dense fog advisory through 10 a.m. Wednesday, warning that visibility on roadways could fall below 100 feet without warning.

The death toll from last week's series of highway crashes blamed on a super fog of smoke from marsh fires mixed with dense fog has been lowered from eight to seven people.

The toll from a series of crashes on I-55 rose to eight dead and 63 injured Tuesday evening, a day after a "super fog" snared more than 160 vehicles in a fiery pileup.

The term super fog describes fog enhanced by smoke from damp, smoldering organic material. It can lower visibility to less than 10 feet.

Crews worked through the night clearing the wreckage of more than 150 vehicles involved in a series of crashes on Interstate 55 near New Orleans.

Many New Orleans schools will start late Tuesday, and a few will close completely, as smoke and fog are expected to make driving hazardous for a second morning.

At least seven people were killed Monday morning after a "super fog" of smoke from south Louisiana marsh fires and dense fog caused multiple massive car crashes.