Highway port cargo (HPC) is a proposed transportation system that would transport freight between highways and ports. It would help reduce traffic congestion by 20-30% by moving freight more efficiently. HPC systems would run on electricity or solar power, saving fuel and reducing carbon emissions. They would be built above highways at a height over 4.5 meters and have a width matching highway lanes. HPC systems would transport freight at speeds over 60km/hr and in lengths over 180 meters, acting as a flexible, economical, and environmentally friendly option for freight transportation.