Something makes me think there’s more to it than that. You’re talking about over a hundred people being reckless which seems hard to believe. I’m guessing that the smoke from the marsh fires wasn’t spread consistently throughout the fog, causing patches of extremely low visibility. The result is that you could have a wreck even when going well below the speed limit because you suddenly go from low visibility to no visibility without any warning (if the smoke is a similar color as the fog it might seem invisible and catch you off guard).