This covers both routine and superload applications.
All Loads must first meet the minimum spacing requirement for overweight which is 51’ of overall spacing and 36’ of inner-bridge. After meeting this requirement is met, the spacings or number of components for overweight will not be considered, instead axle weights and axle group weights along with a passed analysis (via the Superload program) will determine if a permit will be issued.
Maximum group weights are:
Single: 29,000 lbs.
Tandem (less than 4’1’’): 36,000 lbs.
Tandem (4’1’’ and greater): 50,000 lbs.
Tri-axle (less than 4’1’’): 47,000 lbs.
Tri-axle (4’1’’ and greater): 60,000 lbs.
Quad-axle (less than 4’1’’): 60,000 lbs.
Quad-axle (4’1’’ and greater): 80,000 lbs.
If an application fails a bridge analysis or exceeds the stated group weights, either more axles or more components must be added in order to appropriately spread the weight over the vehicle.
Once a vehicle exceeds 120,000 lbs. GVW, it is still considered a superload, but the minimum spacing of 65’ overall spacing and 51’ of spacing for the inner-bridge will not be required. Also, three components will no longer be required when a vehicle exceeds 132,000 lbs. provided the maximum axle or axle group weights are not exceeded and a passed analysis is obtained. The requirement for equalized weight, (2,000lbs. between axles within a group) and all other rules still apply.
The Department recognizes that the use of lift axles is necessary for overweight superload weight distribution and that these axles must be lifted during some turning maneuvers. When such axles are in use and listed as load bearing axles on an overweight superload SHP, they shall remain in the fully lowered position except during turning maneuvers where there would be excessive tire and pavement scuffing or control of the vehicle would be hindered. Such axles shall be part of an air ride suspension group designed to equalize the load over all axles in the group, including the retractable axles.
When using components (Jeep, Trailer, Stinger, Booster, etc.) that are required to be registered and have a license plate, each component with the corresponding license plate must be included on the application for a permit. If a component has a license plate, but does not appear on the permit, or if any component is required to registered and have a license plate and does not, the operator is subject to enforcement action. The home state where the vehicle is registered determines whether or not a registration is required and the component needs a license plate.