Interstate 465 Indiana
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, U.S. 36, U.S. 40, U.S. 52, U.S. 421, SR 37 and SR 67 combine with the 53 mile long loop at some point. Overlapped routes are generally not marked 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.
Upon completion through Perry Township in 2024, Interstate 69 will be cosigned along I-465 around the east side of the beltway. This includes the construction of a directional T interchange west of the exchange joining I-465 with SR 37 at Harding Street.
Source: December 31, 2021 Interstate Route Log and Finders List
I-465 Annual Average Daily Traffic (AADT)
The circumferential route at Indianapolis was part of the original proposed Interstate system for Indiana approved on March 24, 1958. Interstate Route Number A65 applied to the beginning of the route at I-65 south of Indianapolis and running west and north to I-65 near U.S. 52 and 62nd Street. Interstate Route Number B65 represented the east and north side of the loop to I-65, near U.S. 52 north of 86th Street. The leg between I-65 adjacent to Eagle Creek Park and Zionsville was not included in the circumferential highway.
Interstate 465 was selected as the designation for the Indianapolis loop by the Indiana State Highway Department by August 8, 1958. The American Association of State Highway Officials (AASHO) approved the urban Interstate numerology for the state on November 12, 1958.
Interstate 465 superseded portions of Indiana State Road 100. SR 100 represented the original beltway along the East and West Sides of Indianapolis envisioned in the 1950s. Construction of the loop began in 1959 and the first segment opened to traffic in 1961. The entire I-465 loop was completed by 1970.1
I-465 did not directly replace all of SR 100, as a portion of the route remains along Shadeland Avenue. The expressway branches north from I-465 at Exit 48 to Warren Park. This segment was decommissioned as a state road in 1999.
Prior to 2002, Interstate 465 was also signed along the northwestern spur linking the Indianapolis Beltway at Zionsville with I-65 at Royalton. Locally known as the Dog Leg, the 4.72 mile long connector was renumbered as Interstate 865. Approved by the American Association of State Highway and Transportation Officials (AASHTO) on December 15, 2002, the change addressed motorist confusion and preceded completion of the Indianapolis Advance Traffic Management System (ATMS):
Over time this section of Interstate has been labeled by the media and the motoring public as the “I-465 Connector”, “I-465A” and the “465 dogleg”. This is the very source of confusion that we wish to correct.
South End / Zero Milepost – Indianapolis, Indiana
- Indiana Highway Ends – I-465.
- Rebuilding Six I-65 Bridges at I-465 South. Indiana Department of Transportation (INDOT), project web site. Accessed February 6, 2019.
Page updated June 27, 2022.