TUALATIN -- A semi-truck carrying frozen fish rolled over about 5 a.m. in the southbound lanes of I-5 near of Tualatin, closing all southbound lanes.

Two of the four southbound lanes were open by mid-morning and all lanes were opened around noon. The crash caused major traffic delays for over four hours.

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The truck from Vancouver, B.C. was hauling about 20,000 pounds of frozen fish.

The driver, Milan Zeba, 53, fell asleep, according to the Oregon State Police. But his boss, at Blue Land Transportation, said the driver did not fall asleep and the cause of the crash was still under investigation.

Zeba was not hurt. His passenger and co-driver Vlado Crevar, 48, received a minor injury and was taken to Oregon Health & Science University.

Zeba was cited for failure to maintain a lane of travel. The truckers left British Columbia Tuesday night and were headed to San Francisco.

Last summer, ODOTinspections showed that about a quarter of all commercial drivers in Oregon had been on the road too long without rest, according to safety guideline rules.

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