Caltrans tweeted that as many as 50 vehicles are involved in two locations, with as many as 100 vehicles trapped between the scenes. Videos of the scene posted to social media show multiple cars involved in the crash, and at least one in flames. Multiple emergency agencies responded to the scenes. All southbound lanes are shut down while emergency crews work the scene. Southbound traffic is being diverted to Frazier Mountain Park Road. The crash has also caused traffic slowdowns in the northbound lanes. Drivers at the scene noted thick fog and poor visibility.