MADISON - A crash involving a motorcycle early this morning completely shutdown the westbound side of the beltline.

The accident occurred around 12:45am and forced traffic to be re-routed between Monona Drive and South Towne Drive for approximately four hours.

Details as to what caused the crash, how many vehicle were involved, and the severity of injuries to those involved have not been released.

It remains under investigation.

The Madison and Monona Police, Monona Fire, and the State Patrol all responded to the accident.