Police say the incident happened at 3rd and Stewart around 7:20 a.m. Witnesses told KOMO News the bus appeared to have the right of way and the man just walked out in front of it.
The impact was strong enough to break the bicycle rack on the front of the bus, witnesses said.
Police said after the bus stopped, the man walked away, even though he was bleeding from the head. Moments later, a call came into Seattle Fire that a seriously injured man was located outside a Starbucks at Fourth and Pine, said spokesman Kyle Moore.
Moore says the well-dressed man apparently suffered a concussion and wasn't making a lot of sense when firefighters arrived. The victim did manage to tell medics he had been hit and dragged by a vehicle downtown, Moore said.
The man was taken to Harborview Medical Center to be treated for his injuries, and Moore said he was expected to survive.
Further investigation into the crash revealed the bus driver was exhibiting signs of being under the influence of drugs and/or alcohol, Seattle police said. The driver was arrested and taken for a blood draw. He was then released to Metro supervisors.
Metro officials say no alcohol was found in the driver's system.
Meanwhile, Seattle police are still investigating the collision.