The highway infrastructure account is hereby created in the motor vehicle fund. Public and private entities may deposit moneys in the highway infrastructure account from federal, state, local, or private sources. Proceeds from bonds or other financial instruments sold to finance surface transportation projects from the highway infrastructure account shall be deposited into the account. Principal and interest payments made on loans from the highway infrastructure account shall be deposited into the account. Moneys in the account shall be available for purposes specified in RCW
82.44.195. Expenditures from the highway infrastructure account shall be subject to appropriation by the legislature. To the extent required by federal law or regulations promulgated by the United States secretary of transportation, the state treasurer is authorized to create separate subaccounts within the highway infrastructure account.