Arizona Truck Weight Limits

How much a truck can weigh in Arizona

The gross limit is 80,000 pounds, or 82,000 for natural-gas, electric, or idle-reduction rigs (ARS 28-1100). Arizona grandfathers 129,000-pound longer combinations onto designated routes (23 CFR 658 App. C). The overweight civil penalty runs by bracket: $1 for 1,000 or less over, up to $1,400 at 5,000 over, then $100 for every additional 1,000 pounds (ARS 28-1101). A second violation inside six months becomes a criminal misdemeanor.

Axles, off-Interstate, and permits

• Off the Interstate: 80,000 lb (82,000 lb alternative-fuel/idle-reduction); longer combinations higher on designated routes by permit
• Single axle: 20,000 lb (including enforcement tolerances)
• Tandem axle: 34,000 lb (including enforcement tolerances)
• With a permit: Up to about 129,000 lb for longer combination vehicles on designated routes (grandfather/permit); non-divisible superloads higher case-by-case
• Arizona weighs with enforcement tolerances built into the 20,000/34,000 axle numbers. The 129,000-lb LCV permit figure is medium confidence; Arizona is a frozen LCV state and the exact ceiling varies by route and configuration, so confirm with ADOT.

Posted bridge and road limits

ADOT and local agencies post bridges with MUTCD 'WEIGHT LIMIT X TONS' signs; tons are 2,000-pound short tons. A posted limit overrides the legal maximum. If a bridge is posted below your gross weight, you cannot cross and must route around it. Crossing an under-posted bridge is a separate violation and can carry damage liability.

What running heavy costs

Civil penalty by bracket (ARS 28-1101). 1,000 or less over $1; 1,001-1,250 $100; 1,251-1,500 $200; 1,501-2,000 $300; 2,001-2,500 $400; 2,501-3,000 $500; 3,001-3,500 $840; 3,501-4,000 $980; 4,001-4,500 $1,120; 4,501-4,750 $1,260; 4,751-5,000 $1,400; over 5,000 $1,400 plus $100 for each additional 1,000 lb. A second violation within 6 months is a Class 3 misdemeanor; a repeat can rise to a Class 2 misdemeanor.

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