Kentucky Route 21
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| Route information | ||||
| Maintained by KYTC | ||||
| Length: | 17.284 mi (27.816 km) | |||
| Major junctions | ||||
| West end: |
 KY 52 near Paint Lick
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 I-75 in Berea US 25 in Berea US 421 in Bighill
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| East end: | Jackson County line | |||
| Location | ||||
| Counties: | Madison | |||
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Kentucky Route 21 (KY 21) is a 14.196-mile (22.846 km) west-east highway in Madison County, running from the Garrard County line near Paint Lick to Bighill, east of Berea.
It begins at KY 52 at the Garrard County line at the Paint Lick Creek Bridge. The road passes through Wallaceton and traverses over Interstate 75 in Berea, where KY 21 shortly runs along with US 25.
After US 25 breaks away and goes north toward the Blue Grass Army Depot, KY 21 continues to the east and intersects US 421 in Bighill before ending at the Jackson County line.
KY 21 begins at an intersection with KY 52 near Paint Lick in Madison County, heading southeast as two-lane undivided Paint Lick Road. The road passes through farmland with some trees and homes, curving south before heading back to the southeast. The route continues south and then southeast through more rural areas and comes to an intersection with the eastern terminus of KY 954. Following this, KY 21 heads east into wooded areas with some fields and residences, curving to the northeast. The road heads into Berea and enters commercial areas, curving east and coming to an interchange with I-75, at which point it is five lanes wide with a center left-turn lane. Past this interchange, the route becomes Chestnut Street and becomes a four-lane divided highway, intersecting US 25.
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