The bus driver was familiar with the area. No mechanical defects have been discovered in the vehicle. The incident occurred in daylight.
The National Transportation Safety Board (NTSB) investigators have so far been unable to determine what caused a tour bus to leave the roadway in Garfield County, Utah on September 20th, during a Los Angeles – to – Salt Lake City run. The overcorrection that followed led to a crash that killed four of the 30 passengers and injured the rest of the passengers and the driver, 15 of them seriously.