Single Axles: For authorized highways 20,000 Pounds and for others roads 22,400 Pounds. Tandem Axles: For authorized highways 34,000 Pounds and for others roads 36,000 Pounds. Tridem Axles: For a distance of 8 feet, the acceptable weight is 34,000 pounds. When the distance increases to 9 feet, the required weight limit is 42,500 pounds.