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: The State Primary System includes Interstate Highways, Parkways, and other long-distance highways of statewide importance that connect the state's major cities, including much of the courses of Kentucky's U.S. Highways. The State Secondary System includes highways of regional importance that connect the state's smaller urban centers, including those county seats not served by the state primary system. The Rural Secondary System includes highways of local importance, such as farm-to-market roads and urban collectors. Supplemental Roads are the set of highways not in the first three systems, including frontage roads, bypassed portions of other state highways, and rural roads that only serve their immediate area.
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 3000 to 3499 that do not have portions within the State Primary and State Secondary systems.
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KY 3003
Kentucky Route 3003 is a rural secondary highway in eastern Harrison County. The highway begins at US 62 in Oddville. KY 3003 follows Beaver Baptist Road northeast across Beaver Creek, a tributary of the Licking River. The highway reaches its northern terminus at Duckworth Road and Smithsonville Road.
KY 3019
Kentucky Route 3019 is a rural secondary highway in southern Edmonson County. The highway begins at KY 101 (Chalybeate Road) south of Rhoda. KY 3019 follows Chalybeate Road north across Beaverdam Creek, a tributary of the Green River, into the village of Rhoda. The highway intersects Brownsville Road in the village and follows that road across a branch of Beaverdam Creek to its northern terminus at KY 259 (Veterans Memorial Highway) north of Rhoda. The Kentucky Transportation Cabinet established KY 3019 along the bypassed portion of KY 101 and part of the bypassed portion of KY 259 through Rhoda via a September 23, 2002, official order after the latter highway was relocated around Rhoda. The agency transferred Brownsville Road between KY 3019 and the KY 101–KY 259 intersection to county maintenance through the same official order.
KY 3021
Kentucky Route 3021 is a rural secondary highway in central Edmonson County. The highway begins at KY 259 (Veterans Memorial Highway) north of Rhoda. KY 3021 heads north along Brownsville Road, which crosses a branch of Beaverdam Creek, a tributary of the Green River. The highway enters the city of Brownsville and ends at KY 259 (Main Street) south of downtown. The Kentucky Transportation Cabinet established KY 3021 along the bypassed portion of KY 259 south of Brownsville through a September 23, 2002, official order after the latter highway was relocated between Rhoda and Brownsville.
KY 3057
Kentucky Route 3057 is a urban secondary highway in the city of Somerset in Pulaski County. The south–north highway begins at KY 914 and travels north before terminating at KY 1247 .
KY 3064
Kentucky Route 3064 is a one-way supplemental road in the city of Louisville in Jefferson County. KY 3064 is a one-way westbound highway that begins at US 150 and runs westbound along Portland Avenue then Northwestern Parkway before ending at KY 3216, which is a one-way northbound highway and therefore has no access to from KY 3064. From KY 3216, it continues westward as Northwestern Parkway.
Major intersections
KY 3067
Kentucky Route 3067 is a rural secondary road that begins from U.S. Route 60 (US 60) following Booth Field Road. The road heads up north to the ending of state maintenance at the Ben Hawes Park.
KY 3069
Kentucky Route 3069 is a supplemental road in the city of Louisville in Jefferson County. The highway begins at a dead end at a Kentucky Transportation Cabinet maintenance garage in an industrial area next to an R.J. Corman Railroad Group–Norfolk Southern Railway rail line east of the I-65–I-264 interchange near Louisville International Airport. KY 3069 follows Sanita Road east to an intersection with KY 864 (Poplar Level Road) and Gardner Lane at the city limit boundary between Louisville and Watterson Park south of KY 864's interchange with I-264 (Watterson Expressway).
KY 3078
Kentucky Route 3078 is a supplemental road in the city of Louisville in Jefferson County. KY 3078 begins at KY 1065 (Outer Loop) and the western terminus of KY 3079 and travels eastward along the north side of KY 1065 and ends at the eastern terminus of KY 3080.
Major intersections
KY 3079
Kentucky Route 3079 is a supplemental road in the city of Louisville in Jefferson County. KY 3079 begins at KY 1065 (Outer Loop) and the western terminus of KY 3078 and travels eastward along the south side of KY 1065 and ends at the end of state maintenance.
KY 3080
Kentucky Route 3080 is a supplemental road in the city of Louisville in Jefferson County. KY 3080 begins at the beginning of state maintenance and travels eastward to the eastern terminus of KY 3078.
Major intersections
KY 3082
Kentucky Route 3082 is a one-way supplemental road in the city of Louisville in Jefferson County. KY 3082 is a one-way eastbound highway that begins at KY 3216 and the off-ramp from I-264 and travels eastward along Bank Street before ending at US 150.
Major intersections
KY 3095
Kentucky Route 3095 is a rural secondary highway in central Owen County. The highway begins at US 127 and KY 227 in the northern end of the city of Owenton. KY 3095 heads east along Howard Ellis Road and leaves the city limits before reaching its end at KY 1287, which heads south along East Adair Street back into the city and east along Old Sweet Owen Road toward Sweet Owen. The Kentucky Transportation Cabinet established KY 3095 from its current western terminus east to KY 22 near Sweet Owen through a May 4, 1987, official order. The agency established the highway's current eastern terminus when the agency reassigned the eastern section as an extension of KY 1287 in a March 7, 2011, official order.
KY 3101
Kentucky Route 3101 (KY 3101) is a supplemental road in Hawesville that runs from U.S. Route 60 (US 60) north to the eastern terminus of KY 334 following Harrison Street. It then turns onto Main Street and the highway ends at an intersection with KY 69.
KY 3156
Kentucky Route 3156 is a rural secondary highway in central Clinton County. The highway begins at the western junction of US 127 and KY 90. KY 3156 heads east and intersects US 127 in the hamlet of Snow south of the eastern junction of US 127 and KY 90. KY 3156 intersects KY 558 before reaching its eastern terminus at an oblique intersection with KY 2063 near Upchurch. The Kentucky Transportation Cabinet established KY 3156 through a December 4, 1980, official order along the old course of KY 90, whose new course through the area had just been completed.
KY 3172
Kentucky Route 3172 is a supplemental road in east central Logan County and west central Warren County. The highway begins at KY 73 (Cave Springs Road) north of the unincorporated village of South Union; the west leg of the intersection is county-maintained Pleasant View Road. KY 3172 heads east along Shaker Museum Road to the village of Pleasant Hill, where the highway meets the southern end of KY 1466 (Shakertown Road). The village is also known as Shakertown for being one of two remaining Shaker villages in the United States. The Shaker properties are preserved in the Shaker Museum at South Union and the South Union Shaker Center House and Preservatory. East of Pleasant Hill, KY 3172 closely parallels an R.J. Corman Railroad Group rail line and intersects KY 2349 (Hardison Road). KY 3172 crosses the Logan–Warren county line and reaches its eastern terminus at KY 240 (Petros Road) just south of that highway's north end at US 68 and KY 80 (Russellville Road). The Kentucky Transportation Cabinet assigned KY 3172 to the bypassed portion of US 68 through Pleasant Hill through a pair of official orders on January 16, 1997, after US 68's bypass had been completed.
KY 3182
Kentucky Route 3182 is a rural secondary highway in south central Butler County. The highway begins at KY 79 (Russellville Road) north of Dimple. KY 3182 heads east along Richland Church Road and crosses Little Muddy Creek, a tributary of the Barren River, at its confluence with Richland Creek. The highway's eastern is at KY 1083 (Sugar Grove Road) just west of that highway's terminus at US 231 in Needmore. The Kentucky Transportation Cabinet established KY 3182 as a rural secondary highway through a March 8, 1983, official order.
KY 3205
Kentucky Route 3205 is a rural secondary highway in western Butler County. The highway begins at KY 1187 in Silver City; KY 1187 heads southeast along Silver City–Huntsville Road and southwest along Coal Road. KY 3205 heads north along Silver City Road to its end at KY 70 (Rochester Road) west of South Hill. The Kentucky Transportation Cabinet established the route as a rural secondary highway through a March 8, 1983, official order.
KY 3206
Kentucky Route 3206 is a state highway in Jefferson County that runs from Kentucky Route 1230 to the end of State maintenance in Louisville.
Major intersections
KY 3216
Kentucky Route 3216 is a one-way state highway in Jefferson County that runs from the western terminus of KY 3082 north to KY 3064 in Louisville.
Major intersections
KY 3217
Kentucky Route 3217 is a one-way state highway in Jefferson County that runs from KY 3064 south to KY 3082 and the northbound on-ramp for I-264 in Louisville.
Major intersections
KY 3222
Kentucky Route 3222 is a rural secondary highway that begins at US 42. The highway heads north to the county line passing into Oldham County where it meets with an intersection with KY 1793.
KY 3225
Kentucky Route 3225 is a supplemental road in the city of Bowling Green in central Warren County. The highway begins at US 31W on the eastern edge of downtown Bowling Green; State Street heads west through the Shake Rag Historic District. KY 3225 heads east as River Street across the Barren River one block south of the historic College Street Bridge. The highway heads east within a bend of the Barren River to Louisville Road, which carries US 31W, US 68, and KY 80. The Kentucky Transportation Cabinet used a January 17, 1984, official order to assign KY 3225 to a bypassed portion of US 31W on the east side of Bowling Green after US 31W had been rerouted through the city the previous year.
KY 3230
Kentucky Route 3230 is a supplemental road near Little Mount in eastern Spencer County. The highway begins at the entrance to Taylorsville Lake State Park, which lies along the namesake impoundment of the Salt River, at Old Possum Ridge Road. KY 3230 follows Park Road to the highway's eastern terminus is at KY 248 (Briar Ridge Road). The Kentucky Transportation Cabinet redesignated a portion of KY 1416 as KY 3230 after the construction of Taylorsville Lake through a January 17, 1984, official order. The agency transferred the portion of the highway west of its current length to Spencer County via a January 31, 1991, official order.
KY 3238