Wash. Rev. Code § 70.84.040
The driver of a vehicle approaching a totally or partially blind pedestrian who is carrying a cane predominantly white in color (with or without a red tip), a totally or partially blind or hearing impaired pedestrian using a dog guide, a person with physical disabilities using a service animal, or a person with a disability using a wheelchair or a power wheelchair as defined in RCW 46.04.415 shall take all necessary precautions to avoid injury to such pedestrian or wheelchair user. Any driver who fails to take such precaution shall be liable in damages for any injury caused such pedestrian or wheelchair user. It shall be unlawful for the operator of any vehicle to drive into or upon any crosswalk while there is on such crosswalk such pedestrian or wheelchair user crossing or attempting to cross the roadway, if such pedestrian or wheelchair user is using a white cane, using a dog guide, using a service animal, or using a wheelchair or a power wheelchair as defined in RCW 46.04.415. The failure of any such pedestrian or wheelchair user so to signal shall not deprive him or her of the right-of-way accorded him or her by other laws.
RCW 70.84.040
Effective date- 2010 c 184 : "This act takes effect August 1, 2010." [2010 c 184 s 2.]