SEATTLE -- A rollover crash involving a semi truck blocked all southbound lanes of Interstate 5 at Interstate 90 in Seattle for about two hours Thursday.

All lanes reopened at 4:15 p.m. But the crash is still having an impact on just about every major route around Seattle.

While WSDOT was clearing the wreck, southbound traffic stacked up all the way to Northgate, and traffic headed northbound slowed around Boeing Field as well.

Check your traffic -- click here to visit the KING 5 traffic page

The crash involved a semi truck and at least two other vehicles. Four people were extricated bySeattle firefighters and transported to Harborview Medical Center with unknown injuries.

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