Idle Reduction Weight Exemption

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Any motor vehicle equipped with qualified idle reduction technology or other emissions reduction technology may exceed the state gross or axle weight limits, by 550 pounds or the maximum amount allowed by federal law, whichever is greater, to account for the weight of the technology. The additional weight may not exceed the weight of the idle reduction unit. The vehicle operator must also be able to demonstrate that the technology is fully functional.

(Reference Tennessee Code 55-7-203)