Interstate 24 (I-24) is an Interstate Highway in the Midwestern and Southeastern United States. It runs diagonally from I-57, 10 miles (16 km) south of Marion, Illinois, to Chattanooga, Tennessee, at I-75. It travels through Illinois, Kentucky, Tennessee, and Georgia. As an even-numbered Interstate, it is signed as an east–west route, though the route follows a more southeast–northwest routing, passing through Nashville, Tennessee. The numbering deviates from the standard Interstate Highway System grid, lying further north than its number would indicate west of Nashville. The short segment within Georgia bears the unsigned designation State Route 409 (SR 409).
Interstate 69 (I-69) is an Interstate Highway in the United States currently consisting of 10 unconnected segments with an original continuous segment from Indianapolis, Indiana, northeast to the Canadian border in Port Huron, Michigan, at 355.8 miles (572.6 km). The remaining separated segments are variously completed and posted or not posted sections of an extension southwest to the Mexican border in Texas. Of this extension—nicknamed the NAFTA Superhighway because it would help trade with Canada and Mexico spurred by the North American Free Trade Agreement (NAFTA)—five pieces near Corpus Christi, Texas; Houston, Texas; northwestern Mississippi; Memphis, Tennessee; and Evansville, Indiana, have been built or upgraded and signposted as I-69. A sixth segment of I-69 through Kentucky utilizing that state's existing parkway system and a section of I-24 was established by federal legislation in 2008. This brings the total length to about 720 miles (1,160 km).
The Georgia Department of Transportation (GDOT) is the organization in charge of developing and maintaining all state and federal roadways in the U.S. state of Georgia. In addition to highways, the department also has a limited role in developing public transportation and general aviation programs. GDOT is headquartered in downtown Atlanta and is part of the executive branch of state government.
Interstate 840 (I-840), formerly State Route 840 (SR 840), is a freeway that serves as an outer bypass route around Nashville, Tennessee. Built by the Tennessee Department of Transportation (TDOT), it is also designated as Tennessee National Guard Parkway. At 77.28 miles (124.37 km) long, it is the tenth-longest auxiliary Interstate Highway in the nation. The route serves the cities of Lebanon, Murfreesboro, Franklin, and Dickson, all suburbs of Nashville.
Interstate 640 (I-640) is an east–west auxiliary Interstate Highway in Knoxville, Tennessee. It serves as a bypass for I-40 around Downtown Knoxville and is also an alternative route for traffic passing between I-40 and I-75. All trucks carrying hazardous cargo through Knoxville are required to use I-640. It has a total length of 10.80 miles (17.38 km) and runs approximately three miles (4.8 km) north of downtown through the northern neighborhoods of Knoxville.
The Michigan Department of Transportation (MDOT) is a constitutional government principal department of the US state of Michigan. The primary purpose of MDOT is to maintain the Michigan State Trunkline Highway System which includes all Interstate, US and state highways in Michigan with the exception of the Mackinac Bridge. Other responsibilities that fall under MDOT's mandate include airports, shipping and rail in Michigan.
Interstate 440 (I-440) is an east–west auxiliary Interstate Highway that runs through Nashville, Tennessee. It serves as a southern bypass around downtown Nashville, and is located on average about three miles (4.8 km) from the center of the city. I-440 is also known locally as the Four-Forty Parkway, and is designated as the Debra K. Johnson Memorial Parkway. At a length of 7.64 miles (12.30 km), I-440 runs between I-40 and I-24, and connects to I-65 and multiple U.S. Routes. Combined, I-440 and Briley Parkway, a controlled-access segment of State Route 155 (SR 155), form a noncontiguous inner beltway around downtown Nashville.
The Pellissippi Parkway is a major highway in Knox and Blount counties in the Knoxville metropolitan area in Tennessee that extends 19.75 miles (31.78 km) from State Route 62 at Solway to SR 33 in Alcoa. It provides access to the cities of Oak Ridge and Maryville from Interstates 40 and 75 in the western part of Knoxville, and also serves a major corridor that includes Oak Ridge National Laboratory, Y-12 National Security Complex, and a number of science and technology firms. The central portion of the Pellissippi Parkway is included in the Interstate Highway System and is designated Interstate 140 (I-140), while the remainder is designated as State Route 162. The entire highway is part of the National Highway System, a national network of roads identified as important to the national economy, defense, and mobility. It takes its name from an older name for the Clinch River of Native American origin.
U.S. Route 25E (US 25E) is the eastern branch of US 25 from Newport, Tennessee, where US 25 splits into US 25E and US 25W, to North Corbin, Kentucky, where the two highways rejoin. The highway, however, continues as US 25E for roughly two miles (3.2 km) until it joins Interstate 75 (I-75) in the Laurel County community of North Corbin at exit 29. The highway serves the Appalachia regions of Kentucky's Cumberland Plateau and the Ridge-and-Valley section of East Tennessee, including the urbanized areas of Corbin and Middlesboro in Kentucky and Morristown in Tennessee.
State Route 396, commonly referred to as Saturn Parkway, is a 4.47-mile-long (7.19 km) east–west primary state route located in the city of Spring Hill in the U.S. state of Tennessee. The entire route is a controlled-access highway, and provides direct access between the General Motors Spring Hill Manufacturing plant and Interstate 65, as well as the business district of Spring Hill. It takes its name from Saturn Corporation, a subsidiary of General Motors that operated the plant from 1990 to 2007 as its sole manufacturing facility.
The Illinois Department of Transportation (IDOT) is a state agency in charge of state-maintained public roadways of the U.S. state of Illinois. In addition, IDOT provides funding for rail, public transit and airport projects and administers fuel tax and federal funding to local jurisdictions in the state. The Secretary of Transportation reports to the Governor of Illinois. IDOT is headquartered in unincorporated Sangamon County, located near the state capital, Springfield. In addition, the IDOT Division of Highways has offices in nine locations throughout the state.
The Louisiana Department of Transportation and Development (DOTD) is a state government organization in the United States, in charge of maintaining public transportation, roadways, bridges, canals, select levees, floodplain management, port facilities, commercial vehicles, and aviation which includes 69 airports, in the U.S. state of Louisiana. The agency has approximately five thousand personnel on staff and an operating budget of $2.3 billion. DOTD operations are run through nine district offices across the state.
Interstate 81 (I-81) is part of the Interstate Highway System that runs 855.02 miles (1,376.02 km) northward from Dandridge, Tennessee, to the Thousand Islands Bridge at the Canadian border near Fishers Landing, New York. In Tennessee, I-81 serves the northeastern part of the state, running 75.66 miles (121.76 km) from its southern terminus with I-40 in Dandridge to the Virginia state line in Bristol. The route serves the Tri-Cities region of the state and the eastern parts of the Knoxville metropolitan area, terminating about 35 miles (56 km) east of Knoxville. I-81 bypasses most cities that it serves, instead providing access via interchanges with state and federal routes. It remains in the Ridge-and-Valley topographic region of the Appalachian Mountains for its entire length in Tennessee, and runs in a northeast to southwest direction.
The Idaho Transportation Department (ITD) is the state of Idaho governmental organization responsible for state transportation infrastructure. This includes ongoing operations and maintenance as well as planning for future needs of the state and its citizens. The agency is responsible for overseeing the disbursement of federal, state, and grant funding for transportation programs in the state.
Interstate 40 (I-40) is part of the Interstate Highway System that spans 2,556.61 miles (4,114.46 km) from Barstow, California, to Wilmington, North Carolina. In Tennessee, I-40 traverses the state from west to east, from the Mississippi River at the Arkansas border to the northern base of the Great Smoky Mountains at the North Carolina border. At 455.28 miles (732.70 km), the Tennessee segment of I-40 is the longest of the eight states through which it passes, and the longest Interstate Highway in Tennessee.
Interstate 65 (I-65) is part of the Interstate Highway System that runs 887.30 miles (1,427.97 km) north–south from Mobile, Alabama, to Gary, Indiana. In Tennessee, I-65 traverses the middle portion of the state, running from Ardmore at the Alabama border to the Kentucky border near Portland. The route serves the state capital and largest city of Nashville, along with many of its suburbs. Outside of urban areas, the Interstate bypasses most cities and towns that it serves, instead providing access via state and U.S. Highways. The Interstate passes through the Highland Rim and Nashville Basin physiographic regions of Tennessee, and is often used as the dividing line between the eastern and western portions of the former.
Interstate 69 (I-69) is a proposed US Interstate Highway that will pass through the western part of the US state of Tennessee, serving the cities of Union City, Dyersburg, and Memphis. State officials have considered building parts of I-69 as a toll road. Currently, a 21-mile (34 km) section of already-existing freeway in Memphis has been approved for the I-69 designation and a section near Union City is also under construction and scheduled to be completed in Summer 2023.
Interstate 75 (I-75) in the US state of Tennessee runs from Chattanooga to Jellico by way of Knoxville. I-75 enters the East Tennessee region from Georgia, following the Tennessee Valley all the way through Knoxville to near Rocky Top, then climbs into the Cumberland Mountains before crossing over into Kentucky at Jellico.
The State Route System of Tennessee is maintained and developed by the Tennessee Department of Transportation (TDOT) in the U.S. state of Tennessee. Currently the state has 14,150 miles (22,770 km) of state-maintained roadways, including 1,233 miles (1,984 km) of Interstate Highways and 13,077 miles (21,045 km) of State Highways. All of the U.S. Routes in Tennessee have a state route routed concurrently with them, though the state route is hidden and only signed along the green mile marker signs that display mileage within each county. The state route system in Tennessee was established in 1923. Since the 1983 renumbering, state routes have been divided into primary and secondary routes with separate shields used for each.
