Motor vehicle weight limits; vehicles powered primarily by electric battery power or fueled primarily by natural gas. Authorizes motor vehicles powered primarily by means of electric battery power to exceed relevant weight limits by 2,000 pounds, provided that such weight is on the power unit and such weight does not exceed 82,000 pounds on an interstate highway. The bill also changes the weight exemption for motor vehicles fueled primarily by natural gas on an interstate highway from the difference between the weight of the natural gas tank and fueling system and a comparable diesel tank and fueling system to up to an additional 2,000 pounds, provided that such weight is on the power unit and does not exceed 82,000 pounds. Motor vehicle weight limits; vehicles powered primarily by electric battery power or fueled primarily by natural gas. Authorizes motor vehicles powered primarily by means of electric battery power to exceed relevant weight limits by 2,000 pounds, provided that such weight is on the power unit and such weight does not exceed 82,000 pounds on an interstate highway. The bill also changes the weight exemption for motor vehicles fueled primarily by natural gas on an interstate highway from the difference between the weight of the natural gas tank and fueling system and a comparable diesel tank and fueling system to up to an additional 2,000 pounds, provided that such weight is on the power unit and does not exceed 82,000 pounds.