Trinity Road between Trinity and Decatur Old Highway 20 through Mooresville – The section east of Mooresville is part of the 1957 alignment. 1936 Alignment Mooresville Road north of Mooresville through Belle Mina to Old Highway 20. Old Highway 20 east through Greenbrier to County Line Road. County Line Road north to Palmer Road. Palmer Road east to Downtown Madison. Old Madison Pike from Madison to I-565 exit 15. 1957 Alignment Madison Boulevard from I-565 exit 5 to I-565 exit 13. Governors Drive in Huntsville from I-565 exit 17 to Clinton Avenue. Clinton Avenue in Huntsville to US 231/US 431, Memorial Parkway. Corridor V Corridor V is part of the Appalachian Development Highway System and follows the path of SR 20 between Decatur and the eastern Terminus at I-65. See also References External links 020 Decatur metropolitan area, Alabama Huntsville-Decatur, AL Combined Statistical Area Florence–Muscle Shoals metropolitan area Transportation in Lauderdale County, Alabama Transportation in Colbert County, Alabama Transportation in Lawrence County, Alabama Transportation in Morgan County, Alabama Transportation in Limestone County, Alabama