Alabama State Route 300State Route 300 is a short road located entirely in Tuscaloosa [County, Alabama], connecting Fosters with Interstate 20/Interstate 59 ; the route is also known as County Route 10 or Holley Springs Road.Route descriptionThe road begins in Fosters at the intersection of U.S. Route 11, US 43, and County Road 10 and continues south completely surrounded by forest. The route ends right after the junction with I-20/I-59, after that there is a small dead end road.