IN 1 is a discontinuous route with two segments totaling 180 miles. The southern section runs 138 miles from I-275 near Lawrenceburg to I-469 near Fort Wayne, connecting with I-74, I-70, US 50, US 52, US 40, US 35, and US 36. The northern section runs 41 miles from I-69 near Fort Wayne to US 20 near Angola, connecting with US 6.