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1942–45 – November 2026 · the town's second corridor
SR 4 is three roads wearing one number, and Lakeville's is the western one.western segment, SR 2 at La Porte to the US 31 interchange east of Lakeville; a central segment, a Goshen stub (the "Philip T. Warner Highway," 5.310 miles); and an eastern segment, SR 327 at Helmer to I-69 at Ashley (5.935 miles) — no continuity between them, and any telling of SR 4 as one La Porte-to-Ashley road is pre-2016 memory. The western segment's course at the town, in the route record's words: "SR 4 passes on the north side of Lakeville having an intersection with SR 931. The road leaves Lakeville before having an interchange with US 31. SR 4 ends at this interchange but the roadway itself continues east as Pierce Road, a county road in St. Joseph County." Its west end is SR 2 in La Porte. The junction carries two logs, one per road, and both print: on SR 931's log, SR 4 at mile 16.032 (the SR 931 article above); on SR 4's own log (Reference Post Book, July 2016), SR 931 (Michigan Road) at Lakeville stands at mile 25.401, noted "Former US 31," the US 31 interchange the eastern terminus just beyond. The segment's length prints with its pair unmerged, as the sister build carries it (its C106): 25 miles in the route description against 26.5 miles in the state-roads list table — the 25.401 figure is the distance to the SR 931 junction, not a third length, and is not merged into the pair. Entry into the state system: the western segment "was added to the state road system between 1942 and 1945, between LaPorte and Lakeville" (the route history, citing the state highway maps of 1942 and 1945) — a wording that confirms the sister build's map-pair bracket for the Lakeville reach expressly, and settles this reach of the question in part. The number's other datings print labelled by their referents, as the sister build carries them (its C107, pointer here): the number's first map appearance is 1932 (the Goshen designation); a list table's cell prints the western segment "Formed 1935" with no map citation reached behind it; the map pair gives the segment's addition as 1942–45 — three datings, three referents, the map pair the strongest carrier for this ground. The number's earlier lives are pointer facts: before 1926, SR 4 was a southern road (the Evansville–Lawrenceburg corridor, generally today's US 50); the number lay unused 1926–1932; in 2014 the western segment was extended east to the new US 31 interchange in conjunction with the freeway's opening; the central segment's Goshen end moved in 2015–2016 (the pair unmerged in the carriers). Before the state took it, the road was a county road under no number (the sister build's verdict at map-and-negative strength, not contradicted here), and no named auto trail on its alignment through Lakeville was found in the trails article's tests — the east–west trails run north and south of it. Its in-town street name stands with the Patterson question (gap G-RD-4).
Principal sources: the SR 4 route record (route description and history), incorporating the Reference Post Book (July 2016) log (secondary carrier of the official book); the state highway maps of 1942 and 1945 as cited there; the sister build's banked SR 4 record (carried items cited as pointers).