Illinois Fertilizer & Chemical Association
Supply · Service · Stewardship

Wheel, Axle Loads and Gross Weights

Please be aware that during spring planting season and fall harvest, Illinois State Police will be setting up portable scales. Most recently we received notification from our members that had received fines related to exceeding axle limits. All roads in Illinois have standardized weight limits based on the Federal Bridge Formula. The Federal bridge formula allows 20,000# per single axle, 34,000# per tandem axle, and 80,000# maximum gross vehicle weight (GVW.)  Illinois State Police in cooperation with IDOT operate semi-portable scales within the 11 State Police Districts in Illinois. There are also approximately twenty-one permanent scale sites operated by the State of Illinois.