This is for vehicles which are already registered for Idaho, but wish to temporarily operate at a higher gross weight than currently registered for. You may purchase a temporary permit to operate a vehicle or combination of vehicles in excess of the current registered gross vehicle weight up to 105,500 lbs (divisible loads only and not to exceed the legal axle and/or gross weights allowed by Federal Formula B). Temporary permits to increase gross registered weight must be purchased prior to movement on the highway. Registration permits purchased for vehicles hauling reducible loads in excess of 80,000 lbs must also purchase an annual excess weight permit. Extra length permits may also be required.