BOISE -- A man who was hit by a semi truck on Interstate 84 east of Boise this morning is in the hospital. Police say the man's car went off the interstate, sparking a grass fire.

It happened at about 4:30 a.m. south of I-84 between the Eisenman Road Interchange and the Black's Creek rest stop.

Idaho State Police say 37-year-old Patrick Grimm of Pocatello was eastbound when he fell asleep at the wheel. His 2005 Nissan Altima went off the shoulder, through a fence, and traveled 300 yards through the desert. The car came to a stop, but ignited a fire in the dry grass.

Police then say Grimm walked over to the interstate to try to flag down help but was hit by a 2008 International semi driven by 46-year-old Francis Bailey of Burley.

Grimm was flown by Life Fight to Saint Alphonsus Regional Medical Center in Boise. Police say his injuries are non-life threatening. Bailey was not hurt.

A shift in the wind pushed the fire toward the interstate.

We had to shut down the interstate for awhile, due to the fire coming right up to the interstate, said ISP Trooper Quinn Carmack. For the safety of the motoring public, due to smoke and fire, we had to shut that down for awhile.

The fire got close to I-84, but is now out after burning about nine acres. Crews from the Boise Fire Department and Bureau of Land Management were able to fully extinguish the fire around 7 a.m.

The interstate was blocked for about three hours, but both eastbound lanes are now open again.

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