Dense fog caused a long pileup on Lake Pontchartrain Causeway near New Orleans on Tuesday, December 17, involving dozens of vehicles.Thirty-three people were hospitalized with non-life-threatening injuries, local news reported, citing officials.Footage from St Tammany Parish Fire shows the long line of stalled or crashed cars. Local media said there were six separate crashes involving over 40 vehicles in total.Causeway Police said the causeway was closed in both directions on Tuesday morning, and announced that traffic was flowing again by the early evening. Credit: St Tammany Parish Fire via Storyful