Alaska Truck Weight Limits
Complete guide to commercial vehicle weight regulations in Alaska, including axle limits, permit requirements, and seasonal restrictions.
Weight Limits
| Axle Type | Alaska Limit | Federal Limit | Difference |
|---|---|---|---|
| Single Axle | 20,000 lbs | 20,000 lbs | 0 lbs |
| Tandem Axle | 38,000 lbs | 34,000 lbs | +4,000 lbs |
| Tridem Axle | 42,000 lbs | 0 lbs | |
| Quad Axle | 50,000 lbs | 0 lbs | |
| Gross Vehicle Weight | 80,000 lbs | 80,000 lbs | 0 lbs |
| Steer Axle (min) | 12,000 lbs | 12,000 lbs | 0 lbs |
| Steer Axle (max) | 20,000 lbs | 20,000 lbs | 0 lbs |
Alaska has source-verified table, spacing, route, permit, or vehicle-specific rules. The calculator applies verified base limits and implemented contexts, but exact special-case output still needs source-chart fixtures.
Showing interstate route, standard operation.
Bridge Formula
Alaska uses the standard Federal Bridge Formula to calculate maximum weight on groups of consecutive axles.
- W = Maximum weight (lbs)
- L = Distance between outer axles (ft)
- N = Number of axles in the group
Permissible Gross Loads in Alaska
| Permissible Gross Loads for Vehicles in Alaska | ||||||||
|---|---|---|---|---|---|---|---|---|
| Based on FederalBridge Formula: W = 500 × [LN/(N-1) + 12N + 36] | ||||||||
| Showing interstate route, standard operation | ||||||||
Distance (ft) L | 2 AXLES | 3 AXLES | 4 AXLES | 5 AXLES | 6 AXLES | 7 AXLES | 8 AXLES | 9 AXLES |
| 4 | 34,000 | — | — | — | — | — | — | — |
| 5 | 35,000 | — | — | — | — | — | — | — |
| 6 | 36,000 | — | — | — | — | — | — | — |
| 7 | 37,000 | — | — | — | — | — | — | — |
| 8 | 38,000 | 42,000 | — | — | — | — | — | — |
| 9 | 39,000 | 42,000 | — | — | — | — | — | — |
| 10 | 40,000 | 42,000 | — | — | — | — | — | — |
| 11 | 40,000 | 42,000 | — | — | — | — | — | — |
| 12 | 40,000 | 42,000 | 50,000 | — | — | — | — | — |
| 13 | 40,000 | 42,000 | 50,000 | — | — | — | — | — |
| 14 | 40,000 | 42,000 | 50,000 | — | — | — | — | 80,000 |
| 15 | 40,000 | 42,000 | 50,000 | — | — | — | — | 80,000 |
| 16 | 40,000 | 42,000 | 50,000 | 58,000 | — | — | — | 80,000 |
| 17 | 40,000 | 42,000 | 50,000 | 58,500 | — | — | — | 80,000 |
| 18 | 40,000 | 42,000 | 50,000 | 59,000 | — | — | — | 80,000 |
| 19 | 40,000 | 42,000 | 50,000 | 60,000 | — | — | — | 80,000 |
| 20 | 40,000 | 42,000 | 50,000 | 60,500 | 66,000 | — | — | 80,000 |
| 21 | 40,000 | 42,000 | 50,000 | 61,000 | 66,500 | — | — | 80,000 |
| 22 | 40,000 | 42,000 | 50,000 | 61,500 | 67,000 | — | — | 80,000 |
| 23 | 40,000 | 42,000 | 50,000 | 62,500 | 68,000 | — | — | 80,000 |
| 24 | 40,000 | 42,000 | 50,000 | 63,000 | 68,500 | 74,000 | — | 80,000 |
| 25 | 40,000 | 42,000 | 50,000 | 63,500 | 69,000 | 74,500 | 80,000 | 80,000 |
| 26 | 40,000 | 42,000 | 50,000 | 64,000 | 69,500 | 75,000 | 80,000 | 80,000 |
| 27 | 40,000 | 42,000 | 50,000 | 65,000 | 70,000 | 75,500 | 80,000 | 80,000 |
| 28 | 40,000 | 42,000 | 50,000 | 65,500 | 71,000 | 76,500 | 80,000 | 80,000 |
| 29 | 40,000 | 42,000 | 50,000 | 66,000 | 71,500 | 77,000 | 80,000 | 80,000 |
| 30 | 40,000 | 42,000 | 50,000 | 66,500 | 72,000 | 77,500 | 80,000 | 80,000 |
| 31 | 40,000 | 42,000 | 50,000 | 67,500 | 72,500 | 78,000 | 80,000 | 80,000 |
| 32 | 40,000 | 42,000 | 50,000 | 68,000 | 73,000 | 78,500 | 80,000 | 80,000 |
| 33 | 40,000 | 42,000 | 50,000 | 68,500 | 74,000 | 79,000 | 80,000 | 80,000 |
| 34 | 40,000 | 42,000 | 50,000 | 69,000 | 74,500 | 80,000 | 80,000 | 80,000 |
| 35 | 40,000 | 42,000 | 50,000 | 70,000 | 75,000 | 80,000 | 80,000 | 80,000 |
| 36 | 40,000 | 42,000 | 50,000 | 70,500 | 75,500 | 80,000 | 80,000 | 80,000 |
| 37 | 40,000 | 42,000 | 50,000 | 71,000 | 76,000 | 80,000 | 80,000 | 80,000 |
| 38 | 40,000 | 42,000 | 50,000 | 71,500 | 77,000 | 80,000 | 80,000 | 80,000 |
| 39 | 40,000 | 42,000 | 50,000 | 72,500 | 77,500 | 80,000 | 80,000 | 80,000 |
| 40 | 40,000 | 42,000 | 50,000 | 73,000 | 78,000 | 80,000 | 80,000 | 80,000 |
| 41 | 40,000 | 42,000 | 50,000 | 73,500 | 78,500 | 80,000 | 80,000 | 80,000 |
| 42 | 40,000 | 42,000 | 50,000 | 74,000 | 79,000 | 80,000 | 80,000 | 80,000 |
| 43 | 40,000 | 42,000 | 50,000 | 75,000 | 80,000 | 80,000 | 80,000 | 80,000 |
| 44 | 40,000 | 42,000 | 50,000 | 75,500 | 80,000 | 80,000 | 80,000 | 80,000 |
| 45 | 40,000 | 42,000 | 50,000 | 76,000 | 80,000 | 80,000 | 80,000 | 80,000 |
| 46 | 40,000 | 42,000 | 50,000 | 76,500 | 80,000 | 80,000 | 80,000 | 80,000 |
| 47 | 40,000 | 42,000 | 50,000 | 77,500 | 80,000 | 80,000 | 80,000 | 80,000 |
| 48 | 40,000 | 42,000 | 50,000 | 78,000 | 80,000 | 80,000 | 80,000 | 80,000 |
| 49 | 40,000 | 42,000 | 50,000 | 78,500 | 80,000 | 80,000 | 80,000 | 80,000 |
| 50 | 40,000 | 42,000 | 50,000 | 79,000 | 80,000 | 80,000 | 80,000 | 80,000 |
| 51 | 40,000 | 42,000 | 50,000 | 80,000 | 80,000 | 80,000 | 80,000 | 80,000 |
| 52 | 40,000 | 42,000 | 50,000 | 80,000 | 80,000 | 80,000 | 80,000 | 80,000 |
| 53 | 40,000 | 42,000 | 50,000 | 80,000 | 80,000 | 80,000 | 80,000 | 80,000 |
| 54 | 40,000 | 42,000 | 50,000 | 80,000 | 80,000 | 80,000 | 80,000 | 80,000 |
| 55 | 40,000 | 42,000 | 50,000 | 80,000 | 80,000 | 80,000 | 80,000 | 80,000 |
| 56 | 40,000 | 42,000 | 50,000 | 80,000 | 80,000 | 80,000 | 80,000 | 80,000 |
| 57 | 40,000 | 42,000 | 50,000 | 80,000 | 80,000 | 80,000 | 80,000 | 80,000 |
| 58 | 40,000 | 42,000 | 50,000 | 80,000 | 80,000 | 80,000 | 80,000 | 80,000 |
| 59 | 40,000 | 42,000 | 50,000 | 80,000 | 80,000 | 80,000 | 80,000 | 80,000 |
| 60 | 40,000 | 42,000 | 50,000 | 80,000 | 80,000 | 80,000 | 80,000 | 80,000 |
Values reflect FHWA policy of rounding down when calculated weights fall exactly halfway between 500-pound increments.
Alaska has source-verified table, spacing, route, permit, or vehicle-specific rules. The calculator applies verified base limits and implemented contexts, but exact special-case output still needs source-chart fixtures.
Always verify current regulations with Alaska DOT before making shipping decisions.
Seasonal Weight Restrictions
Spring Breakup
30% weight reduction on secondary
Exemptions: emergency
Permit Information
Requirements & Costs
- Overweight threshold
- 80,000 lbs
- Single trip permit
- $100
- Processing time
- 48 hours
- Divisible loads
- Not permitted
- Online application
- Available
Required Documents
- Insurance
- Route Map
Special Vehicle Provisions
winter Weights
Winter weight increases on Elliott, Steese, and Dalton highways (Fairbanks to Prudhoe Bay corridor).
seasonal Restrictions
Spring breakup (mid-March to end of May) imposes 30% weight reductions on secondary roads. Exemptions for emergency and en-route vehicles.
Contact Information
Permit Office
Hours: Mon-Fri 8:00 AM - 5:00 PM AKST
Official Website
Alaska DOT WebsiteCalculate Your Weight Compliance
Use our interactive calculator to check if your truck configuration is compliant with Alaska regulations.
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Get Expert ConsultationSource: Alaska Administrative Code Title 17 | Last Updated: 1/15/2025 | Effective: 1/1/2025
Always verify current regulations with official sources before making shipping decisions.