travels concurrent with SR 306 to Keith Bridge Road. It continues to travel north on its own through Dawsonville, and then travels concurrent with SR 52 from their intersection to just north of Dahlonega. From here, it is again concurrent with US 19/SR 60, until SR 60 splits off in Porter Springs. SR 9 continues alongside US 19 until its terminus at the intersection with US 129/SR 11 at Turners Corner. The following portions of SR 9 are part of the National Highway System, a system of routes determined to be the most important for the nation's economy, mobility, and defense: From its southern terminus to the northern end of the SR 120 concurrency in Alpharetta The entire length of the US 19 concurrency, from Dahlonega to its northern terminus History 1920s and 1930s SR 9 was established at least as early as 1919 along its current route. In 1921, it was extended to Blairsville, concurrent with SR 11. By the end of 1926, it had a "completed hard surface" from Atlanta to the northern part of Sandy Springs, a "sand clay or top soil" surface from the northern part of Sandy Springs to just southwest of Dahlonega, a "completed semi-hard surface" from just southwest of Dahlonega to that city. The extension to Blairsville was decommissioned. By the end of 1930, it had a completed hard surface from just southwest of Dahlonega to that city. By 1932, it had a completed semi-hard surface from the northern part of Sandy Springs to the Forsyth–Dawson county line, a sand clay or top soil surface from the county line to just southwest of Dahlonega, and a "completed grading, no surface course" from just northeast of Dahlonega to its northern terminus. At this time, US 19 was designated along the entire length of SR 9. The next month, the highway had a completed semi-hard surface from the Forsyth–Dawson county line to just north of it and from just northeast of Dahlonega to its northern terminus. In September of that year, it had a completed semi-hard surface from just north of the Forsyth–Dawson county line to Dawsonville and a sand clay or top soil surface from Dawsonville to just southwest of Dahlonega. The next month, it had a completed semi-hard surface from Dawsonville to about halfway between there and Dahlonega. In November, it had a completed semi-hard surface from about halfway between Dawsonville and Dahlonega