Rhode Island General Laws Title 31. Motor and Other Vehicles § 31-25-14. Maximum weight and tandem axles

(a) It shall be unlawful to transport or operate over or upon any public highway in this state any vehicle equipped with tandem axles, should the gross weight of the axles exceed thirty-six thousand pounds (36,000 lbs.) if the axle spacing does not exceed eight feet (8′).

(b) With respect to all public highways, the overall gross weight on a group of two (2) or more consecutive axles of a vehicle or combination of vehicles, shall be determined by the following bridge gross weight formula:

W = 500 [(LN /(N-1)) + 12N + 36]

where W = the overall gross weight on any group of two or more consecutive axles to the nearest five hundred pounds (500 lbs.); L = the distance in feet between the extremes of any group of two (2) or more consecutive axles; and N = the number of axles in the group under consideration. This overall gross weight of any vehicle or combination of vehicles may not exceed eighty thousand pounds (80,000 lbs.) except as specified in §§ 31-25-1, 31-25-2, and 31-25-21.

(c) In any calculation using the formula in subsection (b) of this section in which the tandem axle limit is less than thirty-six thousand pounds (36,000 lbs.), thirty-six thousand pounds (36,000 lbs.) shall be considered the legal limit. Single axle limits shall be as defined in § 31-25-13. Nothing in this chapter shall be construed to abrogate any of the “grandfather rights” in existence as of April 1, 1989.

(d)Penalties.