All vehicles except for passenger cars and pickup trucks weighing under 14,000 lbs are mandated to stop at open Montana Weigh Stations. Any vehicle exceeding 10,000 lbs may undergo inspection and weighing at portable scale locations.

1. The operator is liable to penalties as outlined in 61-10-232 if the gross loaded weight of any trucks, truck tractor, trailer, or semitrailer operating on any state highway exceeds the gross vehicle weight indicated on: (a) the owner's certificate of registration and registration receipt issued under 61-3-322; or (b) the gross vehicle weight license issued under this part.

2. Moreover, the operator must promptly remit to the nearest county treasurer or the department the difference between the fee already paid and that applicable to the gross weight of the vehicle before unloading the excess weight, provided it does not surpass the legal axle weight.

Any owner or operator of a motortruck, truck tractor, trailer, semitrailer, bus, or automobile contravening any provision of this part is deemed guilty of a misdemeanor and shall face a fine of no more than $300 or a maximum sentence of 60 days in the county jail, or both.