RCW 47.36.340
RCW 47.36.340: Motorist information signs—Lodging.
To be eligible for placement of a business sign on a motorist information sign panel a lodging activity shall: (1) Be licensed or approved by the department of social and health services or county health authority; (2) Provide adequate sleeping and bathroom accommodations available for rental on a daily basis; and (3) Provide public telephone facilities.