Motor Vehicles - As introduced, increases, to the extent permissible under federal law, the maximum gross vehicle weight of a vehicle with an axle group of three axles that can be operated on the public highways of this state to 85,000 pounds. - Amends TCA Title 55.

SB 781 increases Tennessee's maximum allowable gross vehicle weight for trucks with three axles (tridems) from the current limit to 85,000 pounds, subject to federal law. This change directly affects commercial trucking companies and drivers operating freight vehicles on Tennessee highways. The bill amends state code to clarify that such vehicles may operate at this higher weight limit, effective July 1, 2025. It does not alter tax requirements or other operational rules beyond the weight specification.