(1) The department may initially register a vehicle that is subject to biennial registration for less than a 24-month period or for more than a 24-month period, not exceeding a maximum of a 30-month period, and prorate the fee on a monthly basis, when in its opinion such fractional registration tends to fulfill the purpose of the biennial registration system.
(2) The department may initially adjust the registration periods of trailers for hire registered as part of a fleet.
(3) The authority granted under this section includes authority to adjust the initial registration period of travel trailers and special use trailers that are required to be registered after being removed from assessment under the ad valorem tax laws by ORS 820.520.
(4) The department, by rule, may adjust registration fees or registration periods for a vehicle, as is administratively convenient for the department, if:
(a) The vehicle is changed from one type of registration to another type; or
(b) Any other change relating to the registration of the vehicle is made where it would be administratively convenient for the department to make such adjustments. [1983 c.338 §224; 1985 c.16 §83; 1985 c.253 §3; 1987 c.750 §6; 1989 c.43 §21; 1993 c.174 §5]