(a) A vehicle or combination of vehicles may not be operated over or on a public highway or at a port-of-entry between Texas and the United Mexican States if the vehicle or combination has:
(1) a single axle weight heavier than 20,000 pounds, including all enforcement tolerances;
(2) a tandem axle weight heavier than 34,000 pounds, including all enforcement tolerances;
(3) an overall gross weight on a group of two or more consecutive axles heavier than the weight computed using the following formula and rounding the result to the nearest 500 pounds:
W = 500((LN/(N – 1)) + 12N + 36)