Montana oversize load rules
Legal limits, pilot car requirements, travel restrictions, superload thresholds and permit fees for oversize and overweight loads in Montana.
Legal limits without a permit
| Width | 8′6″ |
|---|---|
| Height | 14′ |
| Length | 55′ single vehicle · 53′ semitrailer · 75′ truck and trailer combinations |
| Weight | 80,000 lb; MDT does not require a special permit above 80,000 lb when the load is reducible and meets the bridge formula |
What Pro adds for Montana
- 8 escort rules with counts by width, height, length and road type
- 5 travel restrictions: curfews, night, weekends, holidays
- Superload thresholds and conditions
- 5 published fee lines and permit lead time
- Lane routing with miles per state and a cost breakdown
Escort (pilot car) requirements
- 8 width, height and length thresholds with the escort count for each
- Overhang and route-type conditions
Travel restrictions
- 5 restrictions: curfews, night travel, weekends and holidays
- Which ones apply to a given load size
Superloads
- Exact thresholds and what the state requires past them
- Lead times, route surveys and police escort conditions
Permit fees
- 5 published fee lines with links to the fee schedule
- Validity periods and add-on charges
Common questions
When does Montana require a pilot car?
Answer available to members. Start free or sign in.
What is a superload in Montana?
Answer available to members. Start free or sign in.
Can oversize loads run at night in Montana?
Answer available to members. Start free or sign in.
Sources
- MDT Permitting FAQ (legal limits, pilot vehicles, fees, superloads)
- MDT Permit Restrictions (eTRIPs restriction text: travel hours, holidays, pilot vehicles)
- ARM 18.8.509, special permit restrictions and super-load permits
- ARM 18.8.510A, pilot vehicle regulations and equipment
Planning reference. Permits carry their own conditions, and city and county roads have separate rules. Confirm with the Montana DOT Motor Carrier Services (Helena) before moving a load. Found an error? Report it.
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