Topic summary
I-465
Extracted from the Wikipedia article Interstate 465.
Initial construction (1959–1970)
The I-465 beltway was constructed in segments. There were 16 segments along the original proposed semicircumferential alignment between I-65 in Boone County at exit 129 and that same highway six miles (9.7 km) to the south at exit 123 in Marion County. Indiana highway officials recognized the value of having the route be a full circumferential, so using non-Interstate federal funding and employing a temporary designation of SR 100, they planned a separate 17th segment northward between I-65 at its exit 123 and the north leg of I-465 in Boone County. By the time that added section was completed in 1970, Indiana had obtained federal approval to sign it as I-465 as well, resulting in the creation of a dogleg section of I-465 outside of the loop (now signed as I-865).