No person shall operate or move any vehicle or combination of vehicles, including any load, which imposes tire loads upon the surface of a public street, highway, alley, bridge or structure in excess of the following:
(a) In vehicles having metal tires:
(1) Three inches or less in width, a load of 550 pounds for each inch of the total width of tire on all wheels;
(2) Greater than three inches in width, an additional load of 800 pounds shall be permitted for each inch by which the total width of the tires on all wheels exceeds twelve inches.
(b) In vehicles having tires of rubber or other similar substances, for each inch of the total width of tires on all wheels, as follows:
(1) For tires three inches in width, a load of 450 pounds;
(2) For tires three and one-half inches in width, a load of 450 pounds;
(3) For tires four inches in width, a load of 500 pounds;
(4) For tires five inches in width, a load of 600 pounds;
(5) For tires six inches and over in width, a load of 650 pounds.
The total width of tires on all wheels shall be, in case of solid tires of rubber or other similar substance, the actual width in inches of all such tires between the flanges at the base of the tires, but in no event shall that portion of the tire coming in contact with the road surface be less than two-thirds the width so measured between the flanges.
In the case of pneumatic tires, of rubber or other similar substance, the total width of tires on all wheels shall be the actual width of all such tires, measured at the widest portion thereof when inflated and not bearing a load.
In no event shall the load, including the proportionate weight of vehicle that can be concentrated on any wheel, exceed 650 pounds to each inch in width of the tread as defined in this section for solid tires, or each inch in the actual diameter of pneumatic tires measured when inflated and not bearing a load.
(ORC 5577.03)