The entirety of I-90 within Indiana is concurrent with the Indiana Toll Road, which crosses the state's northern fringe and is mostly shared with I-80. From the Illinois state line, the tollway travels south through Hammond and turns east to follow the Grand Calumet River through northern Gary, where it intersects US 41 and US 12. I-90 then crosses I-65 in eastern Gary and I-94 in Lake Station, where it begins a concurrency with I-80.
The entirety of I-90 within Indiana is concurrent with the Indiana Toll Road, which crosses the state's northern fringe and is mostly shared with I-80. From the Illinois state line, the tollway travels south through Hammond and turns east to follow the Grand Calumet River through northern Gary, where it intersects US 41 and US 12. I-90 then crosses I-65, in eastern Gary and I-94 in Lake Station where it begins a concurrency with I-80.