BOISE, Idaho -

An Idaho man who was able to escape a fiery car crash suffered non-life threatening injuries when he was struck by a semitrailer as he tried to flag down help.

The Idaho State Police says 37-year-old Patrick Grimm of Pocatello was eastbound on Interstate 84 east of Boise at about 4:30 a.m. Thursday when he fell asleep at the wheel. His car went off the road, through a fence and came to rest about 300 yards off the road, starting a fire that burned about 10 acres.

Grimm escaped the car and returned to the interstate where he tried to flag down help and was struck by a semitrailer.

The ISP says Grimm was taken to a Boise hospital by air ambulance with non-life threatening injuries.

The crash remains under investigation.