Icy conditions on the Yellowstone River Bridge led to a 30-car crash shortly before noon on Saturday, the Montana Highway Patrol said.
No fatalities were reported, but two people were seriously injured.
Part of Interstate 90 was closed as it took authorities more than two hours to tow all of the wrecked cars away from the scene.
NTSB INVESTIGATING 133 STACKED RACES THAT LEFT SIX PEOPLE DEAD IN TEXAS
One traveler said that while braking to keep cars from stopping in front of her, a pickup truck struck her vehicle, she told the Billings Gazette.
“It was like bumper cars,” he said.
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It was around 30 degrees in Billings when the accident occurred.
One of the deadliest multi-vehicle accidents in recent memory took place earlier this month when six people were killed and dozens injured in a 133-car crash in Fort Worth, Texas.