The crash happened just after 4 a.m. Saturday in the southbound lanes of I-5 near Everett, according to a Washington State Patrol memo. The man's Honda Civic left the road, hit a sign and rolled into a ditch.
The man was listed in serious condition Monday at Harborview Medical Center in Seattle, a hospital spokeswoman said.
A passenger, a 21-year-old Everett man, suffered less serious injuries and also was hospitalized.
The state patrol is investigating.
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