WAC 308-330-555
WAC 308-330-555. Bicycles—Riding on sidewalks
(1) No person shall ride a bicycle upon a sidewalk in a business district.
(2) A person may ride a bicycle on any other sidewalk or any roadway unless restricted or prohibited by traffic control devices.
(3) Whenever any person is riding a bicycle upon a sidewalk, such person shall yield the right of way to any pedestrian.