All northbound lanes on I-39 near Janesville were blocked Friday around noon due to a traffic incident involving a semi.
Seven or eight vehicles were involved in the accident, at approximately 11:39 a.m. Friday, according to the Janesville Gazette and an alert from the Department of Transportation.
Motorists can exit 1-43, north to WIS 140, north on WIS 40 to US 14, west on US 14 back to I-39/90.
Janesville Police say significant traffic congestion can be expected for the next several hours.
The accident was reported to be cleared at 1:19 p.m.