OHIO SPECIAL HAULING PERMITS
AXLE WEIGHT GUIDELINES

The Ohio Revised Code and the Ohio Administrative Code are the authorities on the maximum allowable weights on roadway and bridges within Ohio.  The Hauling Permit Operational Guide, published by the Department of Transportation, explains these guidelines.

The following explanation and example may further help to explain the arithmetic involved.  If there is any conflict between the information here and the primary sources noted above, the latter are to be followed.

All overweight (OW) permit applications are checked for these Axle Weight guidelines. 

Every axle is checked for each guideline as appropriate or as otherwise noted.

Each axle is determined to be defined as one, or a part of, the following definitions:
    a.  SINGLE axle.   Every adjacent axle to this axle is greater than 16 feet  (center to center)
    b.  SHORT TANDEM group.  Two adjacent axles are within 4 feet (<= 4 ft) of each other.
    c.  LONG TANDEM group. Two adjacent axles are within 16 feet (<= 16 ft) of each other.
    d.  SHORT TRI AXLE group.  Three adjacent axles are within 16 feet (<= 16 ft) of which one pair of axles are within 4 feet (<= 4 ft) of each other.
    e.  LONG TRI AXLE group. Three adjacent axles are within 16 feet (<= 16 ft) of each other.
    f.   SHORT QUAD AXLE group.  Four adjacent axles are within 16 feet (<= 16 ft) of which any pair of axles are within 4 feet (<= 4 ft) of each other.
    g.  LONG QUAD AXLE group. Four adjacent axles are within 16 feet (<= 16 ft) of each other.
    h.  The Steering axle is never defined as a Single axle, but it can be part of a Tandem axle group only if both axles are steering axles.
    i.   THREE AXLES 16-32.  Three adjacent axles with combined spacing > 16 ft and <= 32 ft.
   

GUIDELINES         

  1. Single Axle maximum weight allowed is 29,000 pounds.

  2. Short Tandem maximum weight allowed is 36,000 pounds.

  3. Long Tandem maximum weight allowed is 50,000 pounds, provided the tandem has a minimum 4'1" spacing, the vehicle has sufficient inner and outer bridge spacing to achieve the requested weight and the vehicle must pass analysis.    

  4. Short Tri Axle maximum weight allowed is 47,000 pounds.

  5. Short Quad Axle or Long Tri Axle, maximum weight allowed is 60,000 pounds.

  6. Long Quad Axle, maximum weight allowed is 80,000 lbs.     

  7. Tire Load.  For each axle, the maximum weight allowed is the number of Tires, times the tread width of the tire in inches times 800. (Max Lbs. Allowed =  #tires on axle * tire tread width in inches*800)  (e.g. 2 tires with 11 inch tread width ==> 2*11*800 = 17,600 Lbs.)

  8. Minimum Axle Weight.  Every axle except the front axle must have at least 10,000 pounds.

  9. Equalization Within Group (Tandem / Tri / Quad groups).  Within each group, the weight on each axle must not differ by more than 2000 pounds.

10.Three Axles 16-32.  Instead of treating these as two tandem groups, the axle pair with the shorter of the two spacings is analyzed as a tandem group and the third axle as a single axle.  If the two spacings are the same, then two analyses are created: (1) 1st axle as single, 2&3 as tandem, and (2) 1&2 as tandem , 3rd as single.  If at least one of the analyses pass, then the guideline is satisfied.