(a) General information.
  (1) Permits issued under this section are subject to the requirements of §219.41 of this title (relating to General Requirements).
  (2) A single-trip mileage permit:
    (A) is limited to a maximum of seven consecutive days;
    (B) routes the vehicle from the point of origin to the point of destination and has the route listed on the permit; and
    (C) allows the unit to be returned to the point of origin on the same permit, provided the return trip is made within the time period stated in the permit.
  (3) A unit exceeding 175,000 pounds gross weight must:
    (A) have front and rear escort flag vehicles to prevent traffic from traveling beside the unit as it crosses a bridge;
    (B) cross all multi-lane bridges by centering the unit on a lane line;
    (C) cross all two-lane bridges in the center of the bridge; and
    (D) cross each bridge at a speed not greater than 20 miles per hour.
  (4) A unit exceeding 12 feet in width must be centered in the outside traffic lane of any highway that has paved shoulders.
(b) Maximum permit weight limits.
  (1) The maximum permit weight for any single axle must not exceed 30,000 pounds or 850 pounds per inch of tire width, whichever is less.
  (2) The maximum permit weight for any group of axles on a unit will be determined by calculating the "W" weight for the group, using the formulas shown in Figure 2: 43 TAC §219.42(f), titled "Maximum Permit Weight Formulas," and comparing the calculated "W" weight with the corresponding "W" weight that is established in Figure 1: 43 TAC §219.42(f), titled "Maximum Permit Weight Table."
  (3) The maximum permit weight per inch of tire width for axles that are steerable must not exceed 950 pounds, and the maximum permit weight per inch of tire width for axles that are not steerable must not exceed 850 pounds.
  (4) A unit that does not have any group of axles that exceeds the limits established in Figure 1: 43 TAC §219.42(f), "Maximum Permit Weight Table," and Figure 2: 43 TAC §219.42(f), "Maximum Permit Weight Formulas" will be permitted with a single-trip mileage or quarterly hubometer permit for travel on any route that does not include a load restricted bridge.
  (5) A unit that has any group of axles that exceeds the limits established by Figure 1: 43 TAC §219.42(f), "Maximum Permit Weight Table," and Figure 2: 43 TAC §219.42(f), "Maximum Permit Weight Formulas" will be eligible, on an individual case-by-case basis, for a single-trip mileage permit only; permit approval or denial will be based on a detailed route study and an analysis conducted by TxDOT of each bridge on the proposed travel route to determine if the road(s) and bridge(s) are capable of sustaining the movement.
  (6) A road or bridge that has been analyzed and determined to be incapable of sustaining the unit will be excluded from the permit route.
(c) Permit application and issuance.
  (1) An application for a single-trip mileage permit under this section must be made in accordance with §219.41(b) of this title and shall also include the origin and destination points of the unit.
  (2) Upon receipt of the application, the department will review and verify unit size and weight information, check route and mileage to be traveled, compute the permit fee, and advise the applicant of the permit fee.
  (3) Upon receipt of the permit fee, the department will advise the applicant of the permit number, and will provide a copy of the permit to the applicant.
(d) Permit fees and refunds.
  (1) Minimum fee. The minimum fee for a single-trip mileage permit is either the calculated permit fee or $31, whichever is the greater amount.
  (2) Permit fee calculation. The fee for a single-trip mileage permit is calculated by multiplying the number of miles traveled, the highway use factor, and the total rate per mile, and then adding the indirect cost share to the product.
    (A) Highway use factor. The highway use factor for a single trip mileage permit is 0.6.
    (B) Total rate per mile. The total rate per mile is the combined mileage rates for width, height, and weight for the unit. For a trailer-mounted unit, the total rate per mile is based on the overall width, overall height, and all axle weights, including the truck-tractor axles.
      (i) The mileage rate for width is $.06 per mile for each foot (or fraction thereof) above legal width.
      (ii) The mileage rate for height is $.04 per mile for each foot (or fraction thereof) above legal height.
      (iii) The mileage rate for a single axle or any axle within a group that exceeds 20,000 pounds, but is less than or equal to 25,000 pounds, is calculated by multiplying $.045 times the amount by which the axle or axle group weight exceeds the legal weight for the axle or axle group and dividing the resultant figure by 1,000 pounds.
      (iv) The mileage rate for a single axle or any axle within a group that exceeds 25,000 pounds, but is less than or equal to 30,000 pounds, is calculated by multiplying $.055 times the amount by which the axle or axle group weight exceeds the legal weight for the axle or axle group and dividing the resultant figure by 1,000 pounds.
  (3) Permit fees for trailer-mounted units. The permit fee for a trailer-mounted unit is based on the overall width, overall height, and all axle weights, including the truck-tractor axles.
  (4) Refunds. Fees for permits issued under this section are non-refundable.
(e) Amendments. A single-trip mileage permit may not be amended unless an exception is granted by the department.
(f) Weight table and formulas. The following table entitled "Maximum Permit Weight Table" is Figure 1: 43 TAC §219.42(f), and the list of formulas entitled, "Maximum Permit Weight Formulas," is Figure 2: 43 TAC §219.42(f).
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Source Note: The provisions of this §219.42 adopted to be effective February 21, 1999, 24 TexReg 1221; amended to be effective November 21, 1999, 24 TexReg 10143; transferred effective January 1, 2012, as published in the Texas Register January 27, 2012, 37 TexReg 359; amended to be effective June 28, 2015, 40 TexReg 4003; amended to be effective December 14, 2015, 40 TexReg 8900; amended to be effective March 6, 2018, 43 TexReg 1283; amended to be effective December 30, 2020, 45 TexReg 9582; amended to be effective July 18, 2024, 49 TexReg 5161