Our RCW's really do call out some things as being very specific to bicycles or very specific to motor vehicles.

general rules read thus

(3) A vehicle passing around a rotary traffic island shall be driven only to the right of such island.

The following rules shall govern the overtaking and passing of vehicles proceeding in the same direction, subject to those limitations, exceptions and special rules hereinafter stated:

rules that have been determined to only apply to motor vehicles (bicycles are not the only non-motorized transport recognized as a vehicle here) read thus

(1) The driver of a motor vehicle shall not follow another vehicle more closely than is reasonable and prudent, having due regard for the speed of such vehicles and the traffic upon and the condition of the highway.

No person shall drive a motor vehicle at such a slow speed as to impede the normal and reasonable movement of traffic except when reduced speed is necessary for safe operation or in compliance with law: