HB 3331 creates a permit system for vehicles transporting steel. It allows truck-tractor and semitrailer combinations with six axles and specific safety systems to operate at a maximum gross weight of 90,000 pounds under a state-issued permit. The permit costs $1,200 per year, with revenue distributed among the state highway fund, designated counties, and the Texas Department of Motor Vehicles. The bill restricts operations to approved state highways and prohibits local governments from imposing additional fees or permits for such vehicles. The new regulations take effect on January 1, 2026​.