Except as otherwise provided in subsection B, the Commissioner shall disqualify for a period of sixty days any person whose record, as maintained by the Department, shows that he has been convicted of any offense committed while operating a commercial motor vehicle in violation of any law relating to the operation of a motor vehicle at a railroad/highway grade crossing, including but not limited to the provisions of Article 9 (§ 46.2-884 et seq.) of Chapter 8 of this title and the provisions of the Virginia and Federal Motor Carrier Safety Regulations, and any similar law of any other state or any locality.

The period of disqualification shall be for 120 days if the conviction was for an offense described in subsection A, committed within three years of a prior such offense, or for one year if for a third or subsequent such offense committed within three years, provided each offense arose from separate incidents.