Per the Wisconsin Department of Transportation:

“Racine County: on August 1, law enforcement is reporting that the northbound lanes of I-94 are closed at WIS 20 because of a traffic incident. Traffic is using the northbound WIS 20 off and on ramps to get around the crash.”

Also, per Wisconsin Department of Transportation camera network:

This is a North pointing view of their camera showing congestion as far back as Highway KR.