Traffic logic:
Labor Day weekend traffic is usually those people traveling to a local backyard BBQ or to the shore and back.
And while I'm sure there's BBQ in this area, people aren't traveling in for it.
And there sure ain't no beach.

Now when you get local, like say in WI? All bets are off.
The local traffic from lake excursions, Packer games, cheese rallies, brat bbq, etc are a local phenomenon.
Go Pack, GO!