This chapter applies to proportional registration and reciprocity granted under the provisions of the international registration plan (IRP). This chapter shall become effective and be implemented beginning with the 1988 registration year.
(1) The director may adopt and enforce rules deemed necessary to implement and administer this chapter.
(2) Owners having a fleet of apportionable vehicles operating in two or more IRP member jurisdictions may elect to proportionally register the vehicles of the fleet under the provisions of the IRP and this chapter in lieu of full or temporary registration as provided for in chapter 46.16A RCW.
(3) If a due date or an expiration date falls on a Saturday, Sunday, or a state legal holiday, such period is automatically extended through the end of the next business day.