(1) It is a traffic infraction for a licensee under this chapter to drive a commercial vehicle while downgraded for not maintaining a current medical certificate with the department.
(2) A person who violates this section is subject to a penalty of two hundred fifty dollars. If the person appears in person before the court or submits by mail written proof that he or she had, at the time the infraction took place, the medical examiner's certificate, the court shall reduce the penalty to fifty dollars.