The Sunday afternoon crashes on Interstate 15 near the town of Kanosh came at the end of a holiday weekend for the state that often leads to increased highway traffic.

At least 10 people were taken to hospitals, including three in critical condition, according to the Utah Highway Patrol.

Ground and air ambulances were used to transport crash victims.

The pileup occurred during a period of high winds that caused a dust or sandstorm which reduced visibility, the highway patrol said.

Five of the eight people killed were in one vehicle, while two others were in another vehicle, according to a news release. Another fatality was in a third vehicle.

"We have vehicles all over. Several vehicles tried to swerve off the roadway. We have vehicles that are flipped up on their sides," Highway Patrol Sgt. Cameron Rhoden told KUTV in Salt Lake City.

"One of the vehicles that was pulling a trailer, the trailer has pretty much completely been destroyed and is on the freeway."

Kanosh is located about 260 kilometres south of Salt Lake City.

Roadways on Sunday were full of drivers headed home after a long weekend to celebrate a state holiday recognising Utah history and settlers from The Church of Jesus Christ of Latter-day Saints who trekked west in search of religious freedom.

Australian Associated Press