; and (B) agrees to comply with the audit requirements in section 129(a)(3)(B) of title 23, United States Code. (3) For the purposes of paragraph (2), excess toll revenues means revenues in excess of amounts necessary for operation and maintenance; debt service; reasonable return on investment of any private person or entity that may be authorized by the State to operate and maintain the facility; and any cost necessary for improvement, including reconstruction, resurfacing, restoration, and rehabilitation. . 129A. Section 127 of title 23, United States Code, is amended by adding at the end the following: (u) Vehicles in North Dakota A vehicle limited or prohibited under this section from operating on a segment of the Interstate System in the State of North Dakota may operate on such a segment if such vehicle— (1) has a gross vehicle weight of 129,000 pounds or less; (2) other than gross vehicle weight, complies with the single axle, tandem axle, and bridge formula limits set forth in subsection (a)