(a) The maximum wheel load of any one wheel of any vehicle, load, object or structure operated or moved upon improved public highways, streets, bridges or culverts shall not exceed 650 pounds per inch width of pneumatic tire, measured as prescribed by Section 440.10 and Ohio R.C. 5577.03.
(b) The weight of vehicle and load imposed upon a road surface that is part of the interstate system by vehicles with pneumatic tires shall not exceed any of the following weight limitations:
(1) On any one axle, 20,000 pounds;
(2) On any tandem axle, 34,000 pounds;
(3) On any two or more consecutive axles, the maximum weight as determined by application of the formula provided in division (c) of this section.
(c) (1) For purposes of division (b)(3) of this section, the maximum gross weight on any two or more consecutive axles shall be determined by application of the following formula:
W = 500((LN/N-1) + 12N + 36)
(2) In this formula, W equals the overall gross weight on any group of two or more consecutive axles to the nearest 500 pounds, L equals the distance in rounded whole feet between the extreme of any group of two or more consecutive axles, and N equals the number of axles in the group under consideration. However, two consecutive sets of tandem axles may carry a gross load of 34,000 pounds each, provided the overall distance between the first and last axles of such consecutive sets of tandem axles is thirty-six feet or more.
(d) Except as provided in division (B)(9) of this section, the weight of vehicle and load imposed upon a road surface that is not part of the interstate system by vehicles with pneumatic tires shall not exceed any of the following weight limitations:
(1) On any one axle, 20,000 pounds.
(2) On any two successive axles:
A. Spaced four feet or less apart, and weighed simultaneously, 24,000 pounds;
B. Spaced more than four feet apart, and weighed simultaneously, 34,000 pounds, plus 1,000 pounds per foot or fraction thereof, over four feet, not to exceed 40,000 pounds.
(3) On any three successive load-bearing axles designed to equalize the load between such axles and spaced so that each such axle of the three- axle group is more than four feet from the next axle in the three-axle group and so that the spacing between the first axle and the third axle in the three-axle group is no more than nine feet, and with such load-bearing three-axle group weighed simultaneously as a unit:
A. 48,000 pounds, with the total weight of the vehicle and load not exceeding 38,000 pounds plus an additional 900 pounds for each foot of spacing between the front axle and the rearmost axle of the vehicle;
B. As an alternative to division (d)(3)A. of this section, 42,500 pounds, if part of a six-axle vehicle combination with at least 20 feet of spacing between the front axle and rearmost axle, with the total weight of the vehicle and load not exceeding 54,000 pounds plus an additional 600 pounds per each foot of spacing between the front axle and the rearmost axle of the vehicle.
(4) The total weight of the vehicle and load utilizing any combination of axles, other than as provided for three-axle groups in this division, shall not exceed 38,000 pounds plus an additional 900 pounds for each foot of spacing between the front axle and the rearmost axle of the vehicle.
(e) Notwithstanding division (b) and (d) of this section, the maximum overall gross weight of vehicle and load imposed upon the road surface shall not exceed 80,000 pounds.
(f) Notwithstanding any other provision of law, when a vehicle is towing another vehicle, such drawbar or other connection shall be of a length such as will limit the spacing between the nearest axles of the respective vehicles to a distance not in excess of twelve feet and six inches.
(g) As used in division (b) of this section, “tandem axle” means two or more consecutive axles whose centers may be included between parallel transverse vertical planes spaced more than forty inches but not more than ninety-six inches apart, extending across the full width of the vehicle.
(h) This section does not apply to passenger bus-type vehicles operated by a regional transit authority pursuant to Ohio R.C. 306.30 to 306.54.
(i) Either division (b) or (d) of this section shall apply to the weight of a vehicle and its load imposed upon any road surface that is not a part of the interstate system by vehicles with pneumatic tires. As between division (b) and (d) of this section, only the division that yields the highest total gross vehicle weight limit shall be applied to any particular vehicle. Once that division is determined, only the limits contained in the subdivisions of such division shall apply to that vehicle.
(ORC 5577.04)