The maximum gross weight limit and axle weight limit for any motor vehicle equipped with idle reduction technology may be increased by an amount necessary to compensate for the additional weight of the idle reduction technology as provided under 23 U.S.C. §127(a)(12), as that section exists on the effective date of this article. The additional amount of weight allowed by this section may not be construed to be in addition to the tolerance authorized under section eleven-a, article seventeen of this chapter.