Indiana State Road 1

State highway in Indiana, United States

SR 1 began at US 50 and Main Street in Lawrenceburg and traveled north on Main Street until Main Street became Ridge Avenue. It then followed Ridge Avenue until it met the current SR 1.

Between the late 1940s and late 1950s, SR 1 had three or more lanes. This started in Bluffton and continued north to Fort Wayne.

Before being split into two sections on either side of Fort Wayne, SR 1 traveled on a continuous route through that city. From the present northern terminus of its southern section at Interstate 469's exit 6 in south central Allen County, it continued north on Bluffton Road to pass just east of Fort Wayne's main airport (then known as Baer Field). In the Waynedale district of southwestern Fort Wayne, SR 3 joined Bluffton Road from the southwest at Lower Huntington Road. From there the routes originally continued together northward, hugging the bank of the St. Mary's River before curving east to bridge it. SR 1/SR 3 then immediately turned right (south) onto Broadway for about 700 feet (213 m) before turning east on Rudisill Boulevard. From there the routes continued to a one way pair of Clinton Street (southbound) and Lafayette Street (northbound), which then carried a concurrency of US 27 from Decatur and US 33 from St. Marys, Ohio. At Lima Road, SR 3 continues north, as US 27 and SR 1 got on I 69 northbound until exiting at Dupont Road. In later years, after the decommissioning of SR 3 through Fort Wayne and the completion of the Baer Field Thruway (later renamed Airport Expressway), SR 1 was rerouted to turn right onto that roadway, which deposited motorists onto Paulding Road at Fairfield Avenue. From there SR 1 headed east along Paulding Road to its intersection with US 27/US 33 (now Lafayette Street), where it turned left (north) and joined those routes to downtown Fort Wayne. North of Rudisill Boulevard, the original concurrency of US 27/US 33/SR 1/SR 3 (as well as the later concurrency of the first 3 routes) followed the Lafayette Street/Clinton Street pair to downtown Fort Wayne, where US 33 departed to the west. North of downtown, Lafayette Street became Spy Run Boulevard (still one way northbound) until it terminated at the north end of the one way pair with Clinton Street. From there the three (later two) combined routes continued north for a few blocks on Clinton Street to Northrup Street, where they curved northwest onto the latter roadway. Just south of Coliseum Boulevard SR 930 (then U. S. 30), Northrup Street becomes Lima Road, and continues north northwest to I 69. At that point, SR 3 continued (later resumed) northbound on Lima Road to Kendallville, and US 27 and SR 1 both entered I 69 northbound, with SR 1 concurrent with the freeway until the Dupont Road interchange and US 27 concurrent with I 69 into Michigan.

At one point, the northern terminus was at SR 120 just west of the Ohio State Line.