Just as the morning commute began, a semi tractor trailer heading westbound on I-90 overturned blocking all lanes of the freeway. The accident occurred at 6:45 a.m. just west of the Mount Baker tunnel. Fortunately, traffic was able to get past the overturned semi by driving on the shoulder of the freeway. Approximately 45 minutes after the truck accident occurred, the Washington State Department of Transportation pushed the semi to the side of the road allowing traffic to pass on several more lanes of the freeway. This accident is currently still under investigation.