(1) For the purposes of RCW 46.20.291(3), whenever the official records of the department show that a person has committed four or more traffic offenses within a one-year period, or five or more traffic offenses within a two-year period, the department may provide notice to the driver warning them of the risk of crash involvement and the possible consequences of further action against the person's license under this section or chapter 46.65 RCW.

(2) Whenever the official records of the department show that a person has committed six or more traffic offenses within a one-year period, or seven or more traffic offenses within a two-year period, the department must issue a notice of suspension denying the person's driving privilege for 60 days and establishing a 365-day period of probation to begin when the period of suspension ends. During the period of probation, a person must not be convicted of an additional traffic offense.

(3) At a hearing requested by the driver to contest the notice of suspension, the accumulation of violations in subsection (2) of this section shall be considered prima facie evidence of violations of such frequency as to indicate a disrespect for traffic laws or a disregard for the safety of other persons on the highways.

(4) If a person is convicted of a traffic offense during the period of probation, the department must impose an additional 30-day suspension to run consecutively with any suspension already being served under this section.

(5) For purposes of this section "traffic offense" means a conviction as defined in RCW 46.20.270(3), or a finding that a traffic infraction has been committed as defined in RCW 46.20.270(5), of a moving violation as defined in WAC 308-104-160. A traffic offense committed under the provisions of chapter 46.37 RCW by a commercial driver with respect to equipment required on commercial motor vehicles shall not be considered for driver improvement purposes.