BLACK RVER FALLS, Wis. —The driver of a truck-tractor unit died when the rig overturned between the Black River Falls exits on Interstate 94.  Authorities withheld the victim’s name until family could be reached. The accident was about 12:40 p.m. The truck mowed through multiple trees with significant damage to both the cab and trailer. The rig came to rest several hundred feet into the ditch.