Wash. Rev. Code § 81.100.040
The legislature encourages counties, in conjunction with cities, metropolitan planning organizations, and transit agencies in metropolitan areas to adopt goals for reducing the proportion of commuters who drive in single-occupant vehicles during peak commuting periods. Any county imposing a tax under this chapter must adopt such goals. In adopting these goals, counties shall consider at least the following:
[ 1990 c 43 s 15.]