Kentucky supplemental roads and rural secondary highways are the lesser two of the four functional classes of highways constructed and maintained by the Kentucky Transportation Cabinet, the state-level agency that constructs and maintains highways in Kentucky. The agency splits its inventory of state highway mileage into four categories:[1]
The same-numbered highway can comprise sections of road under different categories. This list contains descriptions of Supplemental Roads and highways in the Rural Secondary System numbered 1 to 199 that do not have portions within the State Primary and State Secondary systems.
Kentucky Route 13 is a 5.516-mile-long (8.877 km) rural secondary highway in southern Nicholas County. The highway begins at the Bourbon County line at the South Fork of the Licking River; the route does not extend into Bourbon County.[3] KY 13 heads north along Lower Jackstown Road, which parallels Taylor Creek north to where the route crosses and diverges from the stream at its junction with KY 3316 (Taylor Creek Road). North of KY 386 (Carpenter Road), the highway crosses and follows McBride Run before continuing north toward Carlisle. KY 13 intersects the Transkentucky Transportation Railroad immediately before its terminus at an acute junction with KY 36 (Concrete Road) at the west city limit of Carlisle.[1][2][4]
Kentucky Route 37 is a 18.730-mile-long (30.143 km) rural secondary highway in southern Boyle County. The highway begins at KY 243 at the confluence of Little South Fork with North Rolling Fork, a tributary of Rolling Fork, west of Forkland. Here, North Rolling Fork forms the Boyle–Casey county line; KY 243 immediately heads south onto Little South Road across North Rolling Fork into the latter county. KY 37 heads east on Forkland Road through the valley of North Rolling Fork. The highway passes through Forkland and crosses Hungry Neck Fork at its junction with KY 1108. KY 37 crosses North Rolling Fork twice west of Johnson Branch, which the route crosses just west of its intersection with KY 1822. The highway crosses North Rolling Fork for the last time as the route veers south and follows Shelby Branch to near the Boyle–Casey county line. KY 37 ascends out of the stream valley and descends along White Oak Road to the valley of White Oak Creek. The highway leaves White Oak Creek at its junction with KY 3365 (Hogue Hollow Road) and heads northeast into Junction City, which the route enters along White Oak Lane. KY 37 runs concurrently west along KY 300 along Shelby Street. At the west city limit, the highway splits from KY 300 onto Stewards Lane, which the route follows to its terminus at US 150 Bypass at the edge of the city of Danville.[1][5][6]
Kentucky Route 46 is a 13.656-mile-long (21.977 km) rural secondary highway in southern Nelson County. The highway begins at KY 52 in Nelsonville. KY 46 heads east along Nat Rogers Road to US 31E (New Haven Road) north of Culvertown. US 31E and KY 46 run concurrently northeast to Balltown, where KY 46 turns south at an oblique intersections onto Balltown Road. That highway heads southeast to its eastern terminus at KY 49 (Loretto Road) south of Greenbrier.[1][7][8]