1. Legal Limits (No Permit Needed If You Stay Within These)

You need a permit if you exceed:

 Size Limits

• Width: 8 ft 6 in (102 inches)
• Height: 14 ft
• Length:
  • Single unit: 40 ft
  • Combination vehicles: typically 75 ft (varies by configuration)

 Weight Limits

Washington uses axle spacing and weight tables, but generally:

• Standard maximum gross weight: 80,000 lbs (typical interstate limit)
• Axle group limits also apply and vary based on spacing and configuration

(Weight compliance is determined using axle and tire formulas, not just a single number.)

Washington Oversize And Overweight Permit Requirements for Commercial Trucks