RCW 35.75.060: Use of street and road funds for bicycle paths, lanes, routes and improvements authorized—Standards.

Any city or town may use any funds available for street or road construction, maintenance, or improvement for building, improving, and maintaining bicycle paths, lanes, roadways, and routes, and for improvements to make existing streets and roads more suitable and safe for bicycle traffic: PROVIDED, That any such paths, lanes, roadways, routes, or streets for which any such street or road funds are expended shall be suitable for bicycle transportation purposes and not solely for recreation purposes. Bicycle facilities constructed or modified after December 31, 2012, shall meet or exceed the standards adopted by the design standards committee under RCW 35.78.030.