“The cause appears to be the whiteout/zero visibility conditions brought on by a sudden snow squall,” Montana Department of Justice spokesman Kyler Nerison told CNN.
Other minor injuries were reported, he added.
The incident occurred on I-90 westbound near the I-94 split in Lockwood, about six miles northeast of Billings. I-90 WB was shut down until 4:30 p.m. MST starting at that split while troopers investigated the crash, Nerison said.
The NWS reported light snow and mist in the Billings area since Saturday morning, with temperatures around 20 degrees Fahrenheit in the morning and a high of 32 degrees.