The Commissioner shall disqualify, for a period of two years, any person convicted of violating an out-of-service order while operating (i) a commercial motor vehicle designed to transport 16 or more passengers, including the driver, or (ii) notwithstanding the provisions of § 46.2-341.18, a commercial motor vehicle while used in the transport of hazardous materials required to be placarded under federal Hazardous Materials Regulations (49 C.F.R. Part 172, Subpart F). If the person is convicted of two or more violations of this section, and each offense arose from a separate incident committed within a period of 10 years, the disqualification shall be for five years.