Rule 31-1-5.1 - Commercial Driver License Numbers1. When an applicant, holding a Mississippi regular license number, applies for a commercial license, use the number that is on the regular driver license for the commercial license number.2. Do not change old (001) numbers to Social Security Numbers or 800 numbers. If a person has a Social Security Number on their driver license at the time of receiving a commercial license, they have the option of receiving an assigned driver license number.Miss. Code Ann. §§ 45-1-3 and 63-1-201