Modern History

Additional spurs and loops/bypasses remain under construction, such as Interstate 485 in North Carolina, which has been under construction since the 1980s. A few main routes not part of the original plan remain under construction, such as Interstate 22 in Tennessee, Mississippi, and Alabama and the extension of Interstate 69 from Indiana to Texas. Officials have also identified some non-Interstate corridors for future inclusion into the system, either by construction of new Interstate routes or upgrade of existing roads to Interstate standards.

Due to the cancellation of the Somerset Freeway, Interstate 95 is discontinuous in New Jersey. Authorized by the federal government in 2004, the Pennsylvania Turnpike/Interstate 95 Interchange Project is scheduled to connect the separate sections of I-95 to form a continuous route, completing the final section of the original plan. Construction began in 2010.

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