Interstate 465 is a complete beltway encircling much of Indianapolis, Indiana. The freeway is mostly suburban, with major widening projects undertaken along the East Side in the late 90s and early 2000s and along the West Side (Accelerate465) between 2009-2012. With expansion up to eight lanes, reconstruction also modernized the freeway in both the Park 100 and the Allisonville / Castleton areas.
All U.S. highways and state roads were removed from surface streets within the Indianapolis Beltway over the course of the 1980s and 90s. This created a numbering headache as U.S. 31, 36, 40, 52, 421 and Indiana 37, 67, combine with the 53 mile long freeway loop at some point. Overlapped routes are generally not signed however, with signs solely referencing either I-465 or I-74/465 along the south side of Indianapolis. Guide signs and trailblazers reference the continuation of each respective U.S. route or state road at the Beltway entry points.