Three people were transported to the hospital and one man was seriously injured in two separate rollover accidents on the highway south of Coupeville Thursday evening.

The Washington State Patrol reported that Freeland resident Michael Breiling, 25, was northbound in a 2002 Ford F350 on Highway 525 and drifted over the centerline near the intersection with Houston Road. The truck struck a guardrail, rolled off the roadway and struck a tree.

Breiling was seriously injured and airlifted to Harborview Medical Center in Seattle.

The State Patrol reports that drugs or alcohol may have been a factor in the crash, but the cause is still under investigation.

A few hours earlier, a southbound Brushworks NW van crashed near the intersection of Highway 525 and Race Road.

The driver said he dozed off and didn’t make the turn in the road, according to the trooper at the scene. The van went off the road to the right, struck a tree and rolled on its side.

The driver and a passenger didn’t appear to be injured, but were transported to Whidbey General Hospital as a precaution.