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[citation needed] The first section of Interstate in Alabama opened to traffic was the eight-mile (13 km) stretch of I-65 between northern Jefferson County and Warrior on December 10, 1959. [7] A 26-mile (42 km) segment between Clanton and Calera opened to traffic on March 23, 1961. [8]
The southern terminus of SR 79 is at an interchange of Tallapoosa Street with I-20/I-59 (exit 128) near Birmingham–Shuttlesworth International Airport. Prior to the completion of I-20/I-59, the terminus of SR 79 was at an intersection with US 31 , US 78 , and US 280 at the intersection of 8th Avenue North and 24th Street in downtown Birmingham.
Interstate 422 (I-422), Corridor X-1, or the Birmingham Northern Beltline is a proposed 52.5-mile-long (84.5 km) northern bypass route around Birmingham, Alabama, through northern and western Jefferson County that is projected to be completed by 2047. [2]
The Interstate with the longest segment in Alabama is Interstate 65, covering 367.00 miles (590.63 km); the shortest is Interstate 359, covering 2.30 miles (3.70 km). [1] There are six Interstate primary routes and five Interstate auxiliary routes serving the six largest cities in the state, and 22 of the 25 largest.
U.S. Route 31 (US 31) in Alabama runs north–south up through the heart of Alabama for 386.449 miles (621.929 km). US 31 proper begins at a junction with US 90 and US 98 in Spanish Fort and exits the state into Tennessee running concurrently with Interstate 65 (I-65) near Ardmore .
Like all other Interstate, U.S., and state highways in Alabama, I-59 is a part of the National Highway System for its entire length in the state. Annual average daily traffic along the Interstate varied, with the busiest stretch of the Interstate being the concurrency with I-20 at the SR 79 interchange east of Birmingham, carrying a total of 150,954 vehicles in 2023. [6]
U.S. Route 280 (US 280) is a spur of U.S. Highway 80.It currently runs for 392 miles (631 km) from Blitchton, Georgia, at US 80 to Birmingham, Alabama at I-20/I-59.For much of its route, US 280 travels through rural areas and smaller cities in southern Georgia and east central Alabama.
U.S. Route 78 (US 78) is a major east–west U.S. Highway across the central part of Alabama.It is internally designated State Route 4 (SR 4) by the Alabama Department of Transportation (ALDOT), though the only section of SR 4 that is signed is along portions mainly west of Jasper.