Indiana State Road 135

Indiana State Road 135

Indiana State Road 135 is a north–south highway traversing southern and central Indiana, connecting rural communities to the Indianapolis metropolitan area, regional highways, and border crossings. The route links historic towns, national and state parks, and county seats while intersecting several U.S. Routes and Interstate corridors. It serves as a conduit between agricultural, recreational, and suburban zones, carrying local and through traffic across varied terrain.

Route description

State Road 135 begins near the Ohio River at the Kentucky–Indiana boundary close to Harrison County, proceeding north through mixed farmland, hardwood forests, and karst topography associated with the Hoosier National Forest and the Knobstone Escarpment. The highway passes through or near the county seats of Salem and Paoli, providing access to the Hoosier National Forest trailheads, the Brown County State Park corridor, and recreational sites associated with the Hoosier Uplands region. Along its alignment it intersects major arteries including U.S. Route 150, U.S. Route 50, and Interstate 65, and links to state routes such as Indiana State Road 44, Indiana State Road 58, and Indiana State Road 46, facilitating travel to Louisville, Bloomington, and Indianapolis. Approaching the metropolitan fringe the road transitions to a more suburban character near Franklin and Greenwood, terminating on the south side of Indianapolis near Interstate 70 and industrial corridors serving the Indianapolis International Airport hinterland.

History

The corridor that became State Road 135 has origins in early territorial roadways and 19th-century trade routes connecting river ports on the Ohio River to inland market towns like Salem and Paoli. Designated in the 1920s during the statewide numbering undertaken by the Indiana State Highway Commission and contemporaneous with the creation of the U.S. Numbered Highway System, the route consolidated preexisting county roads and private turnpikes into a continuous state route to improve connectivity to Indianapolis. Mid-20th-century improvements paralleled national infrastructure trends promoted by entities such as the Federal Highway Administration and echoed statewide initiatives under governors and transportation commissioners to pave and straighten corridors for automotive traffic. Segments were realigned in the postwar period to bypass town centers and to meet evolving standards embraced by the American Association of State Highway Officials. More recent decades saw incremental upgrades, safety projects influenced by Indiana Department of Transportation policies, and local partnerships with county governments and metropolitan planning organizations responding to suburban expansion from Marion County.

Major intersections

State Road 135 intersects multiple federal and state routes that serve as nodes in Indiana's transportation network. Notable junctions include crossings with U.S. Route 150 near Paoli, an interchange with Interstate 64-adjacent corridors in southern counties, an intersection with U.S. Route 50 providing east–west access toward Vincennes and Cincinnati, and the connection to Interstate 65 near Greenwood that links to Louisville and Chicago. The route also meets Indiana State Road 46 and Indiana State Road 44, which offer routes to Bloomington and Seymour. Within the Indianapolis area the highway ties into arterial streets and collectors connecting to U.S. Route 31 and Interstate 70 near industrial and logistics nodes.

Traffic and usage

Traffic on State Road 135 varies widely along its length, with rural segments characterized by lower average daily traffic counts dominated by agricultural vehicles, local commuters, and recreational travelers bound for state forests and parks. Near Paoli and Salem seasonal tourism and events influence peak volumes, while suburbanized stretches approaching Greenwood and Franklin exhibit heavier commuter flows and freight movements tied to distribution centers and manufacturing facilities in the Indianapolis metropolitan area. Crash reports and safety analyses performed by the Indiana Criminal Justice Institute and Indiana Department of Transportation have targeted several high-curvature and narrow-shoulder segments for improvements. Freight routing studies by regional planning commissions consider State Road 135 as a secondary connector relieving congestion on primary interstates during incidents affecting Interstate 65 and Interstate 70.

Future and planned projects

Planned projects along the corridor reflect priorities from the Indiana Department of Transportation's statewide transportation plan, local transportation improvement programs administered by metropolitan planning organizations, and county-level infrastructure initiatives. Anticipated work includes pavement rehabilitation, shoulder widening, intersection safety enhancements funded through federal-aid programs administered by the Federal Highway Administration, and targeted bypass or roundabout construction near growing suburban nodes to improve traffic flow and reduce collisions. Coordination with economic development agencies, including county redevelopment commissions and the Indiana Economic Development Corporation, aims to align upgrades with land use changes, logistics demand, and access to multimodal assets such as Indianapolis International Airport. Environmental reviews for projects near karst and forested areas involve consultations with the U.S. Fish and Wildlife Service and the Indiana Department of Natural Resources to mitigate impacts to protected habitats.

Category:State highways in Indiana