Idaho State Police say a Pocatello man fell asleep just before he lost control of his 2005 Nissan Altima and drove off the road and through a fence on Interstate 84 east of Boise early Thursday morning.

The crash ignited a range fire that burned about 10 acres next to the eastbound lanes of I-84 before firefighters could stamp it out.

The driver of the car, 37-year-old Patrick Grimm, is being treated at a local hospital for what ISP officials say appear to be non life-threatening injuries. Grimm was hurt when he tried to flag down help on the highway after the crash and was hit by a semi truck.

Eastbound lanes of I-84 near the Blacks Creek rest stop were closed or restricted to one lane for three hours early Thursday morning so fire crews could work on the blaze.

Here is what ISP officials say happened.

Grimm was driving his Altima on eastbound I-84 near milepost 61, near the Blacks Creek rest area, around 4:30 a.m. when he fell asleep. Grimm’s car went over the right shoulder of the road and went through a fence before coming to a stop about 300 feet from the road.

The wreckage of the car ignited a grass fire. Grimm walked back to I-84 to try to “flag down” some help when he was hit by a semi, going eastbound, driven by 46-year-old Francis Bailey of Burley. Paramedics arrived a short time later and Grimm was taken by air ambulance to Saint Alphonsus Regional Medical Center.

ISP officials are still investigating what happened and had not charged anybody in connection with the case as of noon Thursday.