standards for drivers are:
(1) Operator: Minimum age 16 years except
as provided in sections 61-5-105(1) , 61-5-106, and 61-5-111(4) MCA. Applicants under 18 years of age must have signature of parents, husband,
or wife over 18 years of age, guardian, or employer except as provided in
section 61-5-108 MCA.
(2) Chauffeur, including motor bus driver (common carriers) operating under a
permit issued by the railroad and public service commission, school bus driver,
taxi-cab driver, and private chauffeur: Minimum age 18 years.