The Seattle Times reported the man had been riding in a car with a woman on I-405 just before 11 p.m. Friday.
Washington State Trooper Julie Judson says the woman, who had been driving, pulled over and they were arguing.
She says the man left the vehicle and ran into traffic, where he was struck by a Jeep Cherokee. He was taken to Harborview Medical Center.The driver of the Jeep was not injured.
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