Davidson County, Tennessee is home to a number of major highways and interstates that are integral to the transportation network of Nashville-Davidson County. The Tennessee Department of Transportation (TDOT) maintains 1,984 km (1,233 miles) of interstate highways throughout the state. The interactive map of street, lane, and sidewalk closures is updated every two hours and shows active right-of-way closures in Nashville and Davidson County. The longest interstate in Tennessee is Interstate 40, with a length of 454.81 miles (731.95 km).
This interstate runs from Memphis to Nashville and was the first section of the interstate to be completed between two major cities in Tennessee. The shortest major interstate in Tennessee is I-55, with a length of 12.28 miles (19.76 km) in Memphis. The shortest interstate in Tennessee is the 1.97 mile (3.17 km) Chattanooga I-124, which is not marked; the shortest marked interstate road is the I-275 in Knoxville, with a length of 2.98 miles (4.80 km). The longest auxiliary interstate highway in Tennessee is the I-840, a southern ring road that surrounds Nashville, with a length of 77.28 miles (124.37 km).
Construction of the first segment of Interstate 65 in Giles County, near the Tennessee-Alabama line, began in May 1957. Since then, additional road segments have been added in the state and on December 20, 1974, the last stretches of I-40, I-75, and I-81 in Tennessee opened to traffic. In honor of Senator Gore's influential role in legislating the system, all interstate highways leading to Tennessee bear the inscription “Albert Gore, Sr”.I-24 is an important route for travelers and cargo transportation that runs from Clarksville on the northern border with Kentucky to Chattanooga on the southern border with Georgia and passes through Monteagle Mountain in Marion County. To view active street, lane, and sidewalk closures in Nashville and Davidson County, use the NDOT map of active street, lane, and sidewalk closures. Tennessee's original interstate system was completed with a segment of Interstate 24 in Davidson County and has since become an integral part of the Nashville-Davidson County transportation network. With more than one-third of the state's counties having access to interstates, Tennessee has often been a centerpiece of the transportation movement.