Interstate 565 (I-565) is a Interstate spur that connects I-65 in Decatur with U.S. Route 72 (US 72) in Huntsville in the US state of Alabama. I-565 serves the cities of Decatur, Madison, and downtown Huntsville. It also provides a route to the Huntsville International Airport. The Interstate forms a part of Appalachian Development Highway System Corridor V. U.S. Route 72 Alternate (US 72 Alt.) travels concurrently with I-565 for its entire length. Route description I-565's connection with the rest of the Interstate Highway System occurs at its western terminus, at an interchange with I-65. The interchange was extant prior to I-565's construction; it served State Route 20 (SR 20), which previously extended eastward into Huntsville. (The interchange was rebuilt and improved as part of the I-565 construction.) From the interchange, I-565 takes a brief northerly swing to bypass the town of Mooresville before joining and subsuming the former right-of-way of SR 20 through rural southeastern Limestone County. Progressing eastward, as the western edge of the city of Madison it diverges slightly to the south of the former SR 20 route, traveling parallel to it a short distance away. (This portion of the old SR 20 route is now named Madison Boulevard.) In Greenbrier, the route junctions with Greenbrier Road at a parclo interchange and County Line Road, which is among the most congested interchanges in the state. Immediately after the junction with County Line Road, the route enters Madison County and immediately junctions with the main thoroughfare for Huntsville International Airport. Continuing east, I-565 goes through the southern part of Madison, rejoining the former SR 20 route near the Huntsville–Madison city line. Here, I-565 once again subsumes the old route's right-of-way as it travels along the south edge of Cummings Research Park and the University of Alabama in Huntsville campus and the north edge of Redstone Arsenal. At Governors Drive, I-565 takes a slight turn northward away from the old route and continues through an area generally referred to as "West Huntsville". It enters a elevated stretch resembling a viaduct, has an interchange with Memorial Parkway just south of University Drive, and then, gradually curving toward the northeast, passes north of downtown Huntsville and through a former cotton mill district. At Oakwood Avenue, it subsumes what was once the easternmost of Andrew Jackson Way, traveling over Chapman Mountain to its eastern terminus where it joins US 72. After the