Mont. Code § 61-11-213
A person who is declared to be a habitual traffic offender under this part who operates a motor vehicle in this state during the period of revocation of the person's driver's license or driving privileges is guilty of a misdemeanor and upon conviction shall be imprisoned for a period of not less than 14 days or more than 1 year or fined not more than $1,000, or both, and the department, upon receiving a record of the conviction of a person under this section, shall extend the period of revocation for an additional 1 year. However, in cases in which the prohibited operation of a motor vehicle by a habitual traffic offender is necessitated in a situation of extreme emergency in order to save life, limb, or property, the person may not be considered guilty of a violation under this part.
§ 61-11-213, MCA