The driver of a tractor-trailer died after going off Interstate 84 in south-central Idaho and crashing into a concrete support for an overpass.
Idaho State Police tell KTVB-TV that the crash occurred about 5 a.m. Friday near mile marker 205 in Minidoka County.
Police say westbound lanes are closed and traffic is being diverted.
Eastbound lanes are open but will be shut down later when the truck is removed.
Authorities say 850 West Road will be closed indefinitely due to damage to the support pillar.
It's not clear what caused the crash.
The driver's name hasn't been released.