The portion of US 13 between Dover and Wilmington was built as part of the DuPont Highway. The DuPont Highway was proposed in 1908 by Thomas Coleman DuPont as a modern road that was to run from Selbyville north to Wilmington as part of a philanthropic measure. This roadway was planned to improve travel and bring economic development to Kent and Sussex counties. The DuPont Highway was to be modeled after the great boulevards of Europe and was to have a wide right-of-way consisting of a wide roadway for automobiles flanked by dual trolley lines, wide roadways for heavy vehicles, wide unpaved roadways for horses, and sidewalks. Utilities were to be buried underground below the horse roadways. The highway was also to include agricultural experimental stations and monuments for future surveying. Trolley revenues would help pay for the construction of the roadway. After portions of the DuPont Highway were built, these portions were planned to be turned over to the state at no charge.