The maximum gross weight and axle weight 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) (relating to vehicle weight limitations--Interstate System), as that section exists on the effective date of this act. The additional amount of weight allowed by this subsection shall not exceed 400 pounds and shall be construed to be in addition to the tolerance authorized under 75 Pa.C.S. Ch. 49 Subch. E (relating to measuring and adjusting vehicle size and weight).
35 P.S. § 4604