The Sam Rayburn Tollway (formerly the State Highway 121 Tollway) is a tollway operated by the North Texas Tollway Authority that runs from Grapevine to McKinney. Its frontage road are signed State Highway 121. The original portion of the toll road from Business 121 near Coppell to FM 2281 opened in May 2006, and toll collection started December 1 of that year. The tolled portion extended to Hillcrest Road in Plano/Frisco on August 31, 2008. The tollway was extended to Custer Road on September 1, 2009, and again to Hardin Boulevard in McKinney on October 1, 2009.