"I think the fog is going to have some effect on either people's decisions on when they're going to leave or certainly, if they're out, in getting to where they want to go today," said Beth Mosher, spokeswoman for the AAA Motor Club.



"You know here in Illinois, we're going to see about 2 million people take to the roads and almost 40 million people take to the roads nationwide," she said. "Fog certainly is going to have an affect, and all those people on the roads at the same time, getting to where they want to go."