A crash between a car and a school bus is causing delays on the westbound Beltline Highway at the exit ramp at Fish Hatchery Road.
The Dane County 911 center said the crash was reported at 2:26 p.m.
The school bus was empty except for the driver, the dispatcher said.
Several ambulances and the Sheriff's Office Beltline service truck were responding to the scene because of reported multiple injuries.
More information will be available later.