(2) The commissioner may require any person who meets the criteria set forth in subdivision one of this section to submit to such an examination as the commissioner shall deem appropriate. Every required road test shall be administered on an appropriate vehicle defined as a bus pursuant to section five hundred nine-a of this article.

(3) For purposes of this section, one such accident shall not be counted if the person successfully completes a motor vehicle accident prevention course approved by the commissioner.

(4) Upon the failure of the licensee to successfully complete a reexamination authorized by this section, the commissioner shall take such reasonable action as may be required. Such action may consist of imposing restrictions on the use of the license of such person, suspending such license for a definite or indefinite period, or revoking such license. The commissioner may revoke or suspend for an indefinite period the license of any person who after reasonable notice fails or refuses to submit to such reexamination. No person whose license has been suspended or revoked under this section shall be qualified to operate a bus until such person successfully completes a reexamination authorized by this section.

(5) Upon a driver's successful completion of a reexamination required by this section, the commissioner shall issue an eighteen-month probationary license to such driver and all of the provisions of section five hundred ten-b of this article shall apply.