BELLINGHAM — Washington State Patrol is investigating whether a man involved in an accident on Interstate 5 Saturday afternoon, Sept. 29, was impaired after troopers found a case of beer in his totaled truck.

Witnesses reported a 1997 Chevrolet pickup driven by Ferndale resident Neal Cox, 62, driving erratically on I-5 near Bakerview Road before striking the rear of a 2004 Lexus driven by Blaine resident Diane Cotner, 69, according to state patrol.

After rear-ending the Lexus, the pickup continued northbound, veered from the roadway to the right, went through a chain-link fence and rolled several times, coming to rest on its wheels on Pacific Highway.

Cox was transported to St. Joseph hospital, where he was listed in serious but stable condition as of Saturday evening. Cotner was not injured and was able to drive from the scene. Both were wearing seatbelts.

A third car was damaged by debris from the crash, which slowed traffic but did not block I-5.

The cause of the crash is under investigation due to reports of erratic driving and the case of beer found in the pickup, according to the state patrol. No charges have been filed.