Interstate 84 was not as slippery as glass and was covered with glass after a truck crash on Thursday afternoon.
The truck was about 11 km west of La Grande when the driver lost control at around 12:30 pm, reversing a load of windows on Oregon's main highway east, the transportation department said. 'Oregon.
The eastbound lanes were closed for several hours between Pendleton and La Grande while crews were cleaning the mess. The westbound lanes remained open.
All lanes were closed earlier in the day, from 11 km east of Pendleton to La Grande due to heavy fog in the Cabbage Hill and Meacham areas.
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It is not known if the fog played a role in the crash.
Drivers should be prepared for winter conditions on other routes, said Oregon Highway officials.
I-84 has been intermittently closed in recent days due to winter snow storms crossing the northwest.
Motorists can visit TripCheck.com or call 511 / 800-977-6368 for updated conditions.
Outside of Oregon, motorists can dial 503-588-2941.