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Seattle's Leading Local News: Weather, Traffic, Sports and More | Seattle, Washington | KING5.com

WSP: Semi-truck driver fell asleep before I-5 crash near West Seattle Bridge

Multiple lanes were blocked for hours after a semi-truck lost control and rolled over on I-5 in Seattle.

SEATTLE — Investigators have determined the driver of a semi-truck that crashed on Interstate 5 in Seattle on Saturday morning appeared to have fallen asleep.

"Troopers will be looking into how long the driver had been driving prior to the collision and why he was fatigued," Washington State Patrol Trooper Rick Johnson said in a tweet.

At one point, the crash blocked multiple lanes of northbound and southbound I-5 at South Andover Street, just south of the West Seattle Bridge. As of 1:30 p.m., just the HOV lanes were blocked.

Backups extended several miles for over three hours.

The semi was traveling northbound on I-5 when it lost control and went through the barrier, according to Johnson. One trailer fell on its side in the northbound lanes, and the other trailer rolled into the southbound lanes. A light pole was also down in the southbound lanes.

The driver has minor injuries, according to Johnson.