A large chain-reaction accident blocked US 20 west of West Yellowstone for hours Friday afternoon, when a total of 40 vehicles piled into each other, beginning when a semi-trailer truck slammed into a car stopped in the eastbound travel lane under low visibility conditions.
The Idaho State Police was assisted by Fremont County Sheriff’s Office, Fremont County Search and Rescue, Madison County Sheriff’s Office, the Idaho Transportation Department, West Yellowstone Police Department, Gallatin County Sheriff’s Office, and Madison County Sheriff’s Office.
Several tow companies from Idaho and Montana responded to assist in removing vehicles from the roadway. Fremont County Sheriff Len Humphries said several people were injured in the crashes and ambulances responded from Montana and Madison County to assist local EMS crews.
The crash occurred at 3:00 pm north of Robins Roost, and it took several hours to clear before traffic was moving again.
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