Seattle, Washington – A truck driver fell asleep leading to a messy single-vehicle crash along Interstate 90 on Sunday.

According to Washington State Patrol Trooper Rick Johnson, a semi hauling human waste overturned on Sunday along eastbound Interstate 90 at approximately 12:00 p.m.

Johnson said the truck driver, who suffered minor injuries, fell asleep moments before the accident.

The load of human waste spilled out onto the roadway causing a 4-mile traffic backup.

Here is a pic from the scene EB 90 at SR 900. Driver apparently fell asleep. Minor injuries. ETA to opening is 2 hours. #AvoidEB90. pic.twitter.com/ePjaBPuTID

— Trooper Rick Johnson (@wspd2pio) April 21, 2019