There is hereby created in the motor vehicle fund the RV account. All moneys hereafter deposited in said account shall be used by the department of transportation for the construction, maintenance, and operation of recreational vehicle sanitary disposal systems at safety rest areas in accordance with the department's highway system plan as prescribed in chapter
47.06 RCW. During the 2011-2013 and 2013-2015 fiscal biennia, the legislature may transfer from the RV account to the motor vehicle fund such amounts as reflect the excess fund balance of the RV account to accomplish the purposes identified in this section.