Glenns Ferry — Mario Gonzalez Jr., 46, was headed east on the freeway at about 12:55 p.m. when his 1991 GMC Sierra pickup drifted onto the right shoulder, witnesses told police.
The pickup struck a concrete barrier at the beginning of an overpass, which launched it into the air and sent the vehicle into the ground nose-first, according to a release from the Elmore County Sheriff's Office.
The pickup then rolled several times and rolled down an embankment before landing on North Bannock Street in Glenns Ferry.
Witnesses said Gonzalez did not appear to hit his brakes or try to correct his steering.
Gonzalez, who was not wearing a seatbelt, suffered serious injuries and died at the scene, the sheriff's office said. It appears his injuries were due to the trauma of the crash, Deputy Michael K. Gelalia said.
The Elmore County Coroner's Office will decide whether to conduct an autopsy following a preliminary examination of the body, he said.
There was no indication that alcohol played a role in the wreck, police said.