GHSA maintains data on state laws surrounding a number of highway safety issues. Below is information regarding laws in the state of Montana. Please note that GHSA does not compile any additional data on state laws other than what is presented in these pages. For more information, consult the appropriate State Highway Safety Office.

  • Alcohol Impaired Driving


    Increased Penalty for High BAC Administrative License Suspension on First Offense Limited Driving Privileges During Suspension Vehicle and License Plate Sanctions
    .16 Yes Yes Impoundment, vehicle confiscation

    Ignition Interlocks

    Mandatory for repeat convictions


    Open Container Laws Repeat Offender Laws Alcohol Exclusion Laws Limiting Treatment
    Yes Yes Yes


  • Bicyclists and Pedestrians

    No bicycle helmet laws.

  • Child Passenger Safety

    Child Restraint Required

    Under 6 yrs and under 60 lbs

    Adult Safety Belt Permissible

    Not permissible

    Maximum Fine for 1st Offense


  • Distracted Driving

    No bans on hand-held use, cell phone use, or text messaging for any drivers.

  • Drug Impaired Driving

    DUID Zero Tolerance or Per se Laws for Some Drugs

    • Per se >0 for some drugs

    Marijuana-Specific Laws

    • Possession and Use: Legal for medical use
    • Impaired Driving: THC per se (5 ng)
  • Mature Drivers

    Length of Regular Renewal Cycle

    8 years (or 4 years by mail)

    Provisions for Mature Drivers

    75 and over: renewal every 4 years


  • Motorcyclists

    Helmets required for riders under 18. Universal helmet law repealed 1977.

  • Seat Belts

    Type of Law


    Who Is Covered?

    Riders 6 and over

    In What Seat?


    Maximum Fine for 1st Offense


  • Sobriety Checkpoints

    Checkpoints are not conducted. Statute permits only safety spot-checks.

  • Speed and Red Light Cameras

    Speed Cameras


    Red Light Cameras


    Rail Crossing Cameras


  • Speeding and Aggressive Driving

    Rural Interstates

    Cars (MPH) Trucks (MPH)
    80 65

    Urban Interstates

    Cars (MPH) Trucks (MPH)
    65 65

    Other Limited Access Roads

    Cars (MPH) Trucks (MPH)

    Day: 70

    Night: 65

    Day: 70 (Light Trucks), 60 (Heavy Trucks)

    Night: 65 (Light Trucks), 55 (Heavy Trucks)

  • Teen and Novice Drivers

    Full Privilege Minimum Age

    16 years

    Learner Stage

    Minimum Age (Years/Months)

    Minimum Duration (Months)

    Required Supervised Driving Hours (Night Hours)

    14 / 6 6 50 (10)

    Intermediate Stage

    Minimum Age (Years/Months)

    Nighttime Driving Restriction

    Passenger Restriction (except family, unless noted)

    15 11 p.m. - 5 a.m.

    First 6 months: no more than 1 under 18

    Second 6 months: no more than 3 under 18

  • Work Zones

    Violations Affected


    Enhanced Penalties

    Minimum double original fine

    Workers Must Be Present?


    Signs Must Be Present?