U.S. Route 30 in Indiana

US 30 enters Dyer from Lynwood, Illinois, along the original alignment of the Lincoln Highway, as a four-lane divided highway. At Moeller Street, the roadway becomes a four-lane highway with a center turn lane before reaching an at-grade intersection with CSX railroad tracks. Thereafter, the road returns to four-lane divided highway before a traffic light at US 41 in Schererville and passing under Norfolk Southern railroad tracks. After US 41, the original alignment of the Lincoln Highway leaves US 30 and continues along the same route as old State Road 330 (SR 330). US 30 begins to curve towards the southeast, still as a four-lane divided highway. The highway has a traffic light at SR 55, heading east as the roadway enters Merrillville, where the route becomes a six-lane divided highway and has an interchange at Interstate 65 (I-65). At Colorado Street in Merrillville, the road narrows back to a four-lane divided highway.[7][8][9]

US Route 30 in Indiana.

After a traffic light at the southern terminus of SR 51 in Hobart, the original alignment of the Lincoln Highway rejoins US 30. The highway passes through a mix of farmland and residential properties on the way to Valparaiso, entering the city and passing through commercial properties. The highway has a traffic light at SR 2 at the western end of the concurrency of the two roads. From there, the road crosses railroad tracks, passes south of Valparaiso University, and has a traffic light at the eastern terminus of SR 130. After passing the traffic light at SR 130, the road has a full interchange with SR 49 and the eastern terminus of the SR 2 and US 30 concurrency. Continuing east, the road passes the Porter County Municipal Airport and proceeds east-southeast from Valparaiso, towards Plymouth.

After leaving the Valparaiso area, US 30 passes through rural farmland, with an intersection at US 421 northeast of Wanatah and an at-grade railroad crossing with the Chesapeake and Indiana Railroad. East of the railroad tracks is an intersection with SR 39 and a bridge across the Kankakee River.[7][8][9] Then the route briefly swings slightly to the north of the old Lincoln Highway alignment to accommodate an interchange at US 35.

US 30 runs along the north side of Plymouth, passing through an interchange with the northern terminus of SR 17 and near the Plymouth Municipal Airport. The route curves around the northeast side of the city, having a major interchange with US 31 before heading east-southeast towards Warsaw. At Bourbon, the highway has an interchange with SR 331. The road curves east before entering Warsaw and has an interchange with SR 15, south of the Warsaw Municipal Airport. After passing the airport, the road enters a mix of commercial and residential properties. As it bypasses Warsaw the highway passes through a highly commercial area and has nine traffic signals within four miles, causing frequent traffic backups. One of these is a traffic light at an old alignment of the Lincoln Highway, before US 30 passes north of Winona Lake and heads towards Columbia City.

At Columbia City, the road turns southeast and has traffic lights at SR 109, SR 9, and SR 205, again closely spaced, resulting in frequent congestion. After SR 205, US 30 heads east towards Fort Wayne, paralleling the Chicago, Fort Wayne and Eastern Railroad.[7][8][9]

U.S. Route 30 west of Fort Wayne, Indiana.

US 30 crosses into Allen County at a signalized intersection with Whitley County Road 800 East (signed as County Line Road). After passing a pair of abandoned rest areas, the four-lane divided highway with partial access control then becomes a full access controlled freeway just east of the signalized intersection at Kroemer Road. Immediately thereafter, there is a trumpet interchange with US 33 (Goshen Road), at the western terminus of US 33's concurrency with US 30. From there, the joined routes proceed southeast as a six-lane (counting auxiliary lanes) freeway, passing under Hillegas Road, to a cloverleaf interchange with I-69. At that junction, US 33 joins southbound I-69 (and westbound US 24), while US 30 loops to the north, to run concurrent with both northbound I-69 and eastbound US 24. The through lanes revert to an urban arterial and continue southeast into Fort Wayne as Goshen Road, carrying SR 930 only as far as Coliseum Boulevard (where it departs to the east, leaving Goshen Road to revert to an undivided city street).

US 30's concurrency with I-69 is a six-lane urban interstate with interchanges at Lima Road (US 27 and SR 3) and Coldwater Road (formerly SR 327 and prior to that, US 27). At the interchange of I-69 and I-469, US 30 heads east concurrent with I-469 to loop around the north and east sides of Fort Wayne, heading toward New Haven. I-469 is a four-lane interstate passing through a mix of farmland and suburban residential properties. Initially proceeding east, the interstate crosses the St. Joseph River and has an interchange at Maplecrest Road before turning southeast, then south around the northeast side of Fort Wayne to subsequent interchanges with SR 37 followed by US 24. After the US 24 interchange, the interstate crosses the Maumee River and Norfolk Southern railroad tracks before US 30 departs I-469 east of downtown New Haven at the eastern terminus of SR 930.

After I-469, US 30 heads southeast away from New Haven, passing through rural farmland as a four-lane divided highway with partial access control. The route bypasses the tiny hamlets of Zulu, Tillman, and Townley with an intersection at SR 101 just to the north of the latter. US 30 completes its journey across the Hoosier State and enters Ohio (at State Line Road), continuing southeast toward Van Wert.[7][8][9]