Truck weight limits
Montana
✓ Sources verifiedEditorial review pending credentialed reviewer5 primary sources
Montana holds axles to 20,000 lb and tandems to 34,000 lb, but states no gross weight figure at all — § 61-10-107 defines gross weight purely by the bridge formula and defers to department rules based on 23 CFR part 658, appendix C. Dimensions are 102 inches wide and 14 feet high.
At a glance
Max gross weight—
Max single axle20,000 lb
Max tandem axle34,000 lb
Permit (width)102 in
Permit (height)14 ft
vs. federal gross—
1 Limits and thresholds
| Property | Value | Authority |
|---|---|---|
| Max single axle | 20,000 lb[1] | § 61-10-107(1)(a) |
| Max tandem axle | 34,000 lb[1]Two consecutive axles more than 40 in and less than 96 in apart. | § 61-10-107(1)(a) |
| Oversize permit above (width) | 102 in[2] | § 61-10-102 |
| Oversize permit above (height) | 14 ft[2] | § 61-10-103 |
| CDL disqualification — first major | 1 year for a first conviction while operating a CMV or a non-CMV; 3 years if operating a CMV transporting placarded hazardous materials. Applies to alcohol/controlled-substance influence, 0.04+ BAC in a CMV, test refusal, leaving the scene, using the vehicle in a felony, driving while disqualified, and causing a fatality by negligent operation.[3]Federal floor. A state may impose longer periods but may not go below this; verify state law before relying on it. | § 383.51(b), Table 1 |
| CDL disqualification — lifetime | Life for a second conviction of any combination of the Table 1 major offences in a separate incident. A state MAY reinstate after 10 years following an approved rehabilitation programme — § 383.51(a)(6) — but not after a subsequent disqualifying conviction. Felony manufacture/distribution of a controlled substance, and severe forms of human trafficking, draw life with NO 10-year reinstatement.[3]Federal floor. The 10-year reinstatement is permissive — states are not required to offer it. | § 383.51(a)(6), (b) Table 1 items (9)–(10) |
2 Sources
- MCA 61-10-107 — Maximum gross weight — Montana Legislative Services Division
- MCA 61-10-102, 61-10-103 — Width and height — Montana Legislative Services Division
- 49 CFR § 383.51 — Disqualification of drivers — U.S. Government Publishing Office
- Mont. Code Ann. § 61-9-406 — Restrictions as to tire equipment: particular tires, chains, or traction devices — Montana Legislative Services Division
- Mont. Code Ann. § 61-8-312 — Special speed limitations on trucks, truck tractors, and motor-driven cycles — Montana Legislative Services Division
Review record
Every figure above was transcribed from the primary source cited beside it and carries a pinpoint locator. Editorial review by a credentialed reviewer is pending.