MAJOR crash investigators are seeking witnesses to a fatal crash about 5.30am today on the Great Eastern Highway.
A Ford Falcon sedan travelling east through Grass Valley collided with a truck towing two trailers heading west in Muluckine, about 15kms east of Northam.
The 18-year-old Ford Falcon driver from Wooroloo died at the scene.
The 64-year-old Merredin driver of the prime mover received serious injuries.
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READ NOWHe was airlifted by RAC rescue helicopter to Royal Perth Hospital.
A Royal Perth Hospital spokeswoman said the truck driver was in a serious but stable condition.
Fire crews from Ellenbrook, Northam and York attended and cleaned up fuel and grain spills.