 During the 1920s, Route 50 was part of the Lone Star Trail, an early auto trail that roughly followed the present US 84 corridor across Louisiana in the days before the numbered U.S. Highway system was implemented.The middle section of LA 9 from Creston to Homer made up the majority of State Route 12, another of the original 98 state highway routes designated in 1921.While LA 9 changes its general trajectory by turning northeast at Homer toward Junction City, Route 12 continued northward along the present path of US 79 to the Arkansas state line via Haynesville.