A county may not, through an interlocal cooperation agreement with a city or other municipal corporation, use county revenue generated under the tax imposed pursuant to RCW 82.46.010(1) to fund capital improvements on property owned by the city or municipal corporation, unless the county can show that the improvements relate to a county function or serve a county purpose.
A public transportation benefit area may not use its funds for improvements or maintenance of public roads and streets by means of an interlocal cooperation agreement with cities and/or counties, because the public transportation benefit area is not legally responsible for road and street construction or maintenance.
The City of Seattle, the State Highway Commission, King County, the Port of Seattle, and, to a limited extent, the Municipality of Metropolitan Seattle (Metro) may form a joint venture under the interlocal cooperation act (chapter 39.34 RCW) for the construction of an improved West Seattle bridge.