a “superfog” of smoke from Louisiana marsh fires and dense fog resulted in a massive car crash Monday morning involving 168 vehicles, around 9 a.m. Monday along a one-mile stretch of the elevated interstate

School buses were summoned to transport stranded motorists from the accident sites on the elevated I-55, which passes over swamp and open waters between lakes Pontchartrain and Maurepas.

Meteorologists earlier said “super fog” had heavily impacted the area, just west of New Orleans, around the time of the pileups. Super fog is a thick fog that develops in damp, smoky conditions and can send visibilities plummeting to less than 10 feet, according to the National Weather Service.

https://www.theguardian.com/us-news/2023/oct/23/louisiana-marsh-fires-superfog-car-crash-pileup

https://www.cnn.com/2023/10/23/us/louisiana-fog-i55-crash-new-orleans/index.html

https://apnews.com/article/superfog-louisiana-highway-crashes-marsh-304195491d1bfbc5ac929b1c6acd1d7f