Missouri Commercial Vehicle Regulations

Missouri Commercial Vehicle Regulations

• Maximum Vehicle Height:
  • Outside commercial zones on designated highways and 10 miles beyond: Maximum height varies, details not provided.
  • Within commercial zones: Maximum height varies, details not provided.
  • Commercial zones exist in cities with 75,000 or more residents.
• Commercial Zone Extent:
  • Commercial zones extend one mile beyond city limits, plus one mile for every 50,000 residents or portion thereof.
  • Specific examples for St. Louis, Kansas City, Springfield, St. Joseph, and Columbia are not stated.
  • Interstate commercial zones extend a set number of miles beyond city limits (a figure is not provided).
• Maximum Vehicle Lengths:
  • Buses and Trackless Trolley Coaches: Maximum length is unspecified, subtracting one foot from front and back for safety bumpers.
  • Truck-Tractors and Semi-Trailers:
    • On interstates and certain designated highways: Maximum length is unspecified.
    • On all other roads: Maximum length is unspecified.
    • Combination lengths for truck-tractors, semi-trailers, and trailers have maximum lengths on interstates and other roads (values not specified).
  • Automobile and Boat Transporters (conventional 5th wheel and stinger-steer): Maximum length is 75 feet, plus 3 feet of front and 4 feet of rear overhang.
  • Driveaway Saddle Mount Combinations (double or triple): Maximum length is unspecified on interstates and other highways (values not specified).
• Load Extensions:
  • Excess load permitted to be up to 3 feet beyond front and 4 feet beyond the rear.
• Maximum Axle Weights:
  • Single Axles:
    • On interstates: 20,000 pounds.
    • In commercial zones: 22,400 pounds.
    • On all other routes: 22,000 pounds.
  • Tandem Axles:
    • On interstates: 34,000 pounds.
    • On all other routes: 36,000 pounds.
• Gross Weight Calculations:
  • Maximum gross weight depends on the distance between the first to the last axle.
  • In commercial zones, multiply the number of axles by 22,400 pounds.
  • Maximum gross weight permitted on interstates, primary and other designated highways is 80,000 pounds.
• Permits:
  • Over-dimension and overweight permits are obtained from the Missouri Department of Transportation, Motor Carrier Services Unit.
• Load Requirements:
  • Loads must be non-reducible for permitting.
• Exemptions:
  • Farm machinery, vehicles transporting farm machinery, dealers delivering or moving farm equipment, and vehicles transporting road materials and disabled vehicles are exempted from certain regulations.