In the state of Indiana, I-80 runs concurrent with another Interstate highway for its entire length. It runs with I-94 on the Borman Expressway before joining I-90 to Ohio on the Indiana Toll Road.
The portion of I-80 between La Porte, Indiana and Toledo, Ohio runs (with I-90) within ten miles (16 km) of the Michigan state line. From the State Route 9 and I-80 intersection, the sign marking the Indiana-Michigan state line is visible. At another point in northern Indiana, I-80 comes within about 200 yards (meters) from the Michigan border.