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.

HB 770 would increase Tennessee's maximum allowable weight for three-axle commercial trucks (tridems) on public highways from current limits to 85,000 pounds, subject to federal law. This change directly affects commercial truck operators and freight transportation companies that use these specific vehicle configurations. The bill amends state code to set this new weight standard while requiring operators to pay additional taxes for weight overages within 90 days. The bill failed in the Transportation Subcommittee on March 4, 2025, and did not advance further. If enacted, the change would take effect July 1, 2025.