An 18-year-old man was killed on Colorado Highway 13, but the accident wasn't reported for an estimated three hours.
The teen -- whose name could not be released Wednesday because his family had not been notified -- was driving north on Highway 13 when he veered to the left, said Colorado State Patrol Sgt. Gary Meirose. Once off the road, the black Ford Excursion began rotating counterclockwise and then rolled 2 1/4 times before coming to rest on the driver's side, Meirose said.
Meirose said it is unclear what caused the accident. Drug and alcohol tests are being conducted, and results are pending.
Officers estimate the accident occurred about 2 a.m. Wednesday morning and was reported by a passer-by at 5 a.m.
Meirose said the teen was wearing his seat belt but that his vehicle's airbag did not deploy.
The accident occurred 31 miles north of Craig. The driver, who was the sole occupant of the vehicle, holds a California driver's license. Officers suspect he was living in Northwest Colorado but have no confirmation of that.