Kentucky Route 255
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| Route information | ||||
| Maintained by KYTC | ||||
| Length: | 14.700 mi (23.657 km) | |||
| Major junctions | ||||
| South end: |
 KY 252 near Rocky Hill
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  US 68 / KY 80 at Bon Ayr US 31W in Park City I-65 at Park City |
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| North end: |
 KY 70 in Mammoth Cave National Park. |
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| Location | ||||
| Counties: | Barren, Edmonson | |||
| Highway system | ||||
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Kentucky Route 255 is a south-north highway located in south central Kentucky. It provides access to Interstate 65 and Mammoth Cave National park to residents of southern Barren County.
KY 255 begins at a junction with KY 252 in Barren County, near the Rocky Hill community. The route is narrow and considerably curvy until coming to a junction with KY 1297 3.3 miles (5.3 km) later.
After this junction, the route straightens somewhat, proceeding north for another 3.1 miles (5.0 km) before coming to an intersection with the cojoined US 68/KY 80 in the Bon Ayr community.
KY 255 widens somewhat past this point, continuing on for another mile before bridging the Cumberland Parkway via way of an overpass. The route then proceeds north for 0.8 miles (1.3 km) before coming to an intersection with KY 1339.
KY 255 then continues north for 2.5 miles (4.0 km) before being carried onto a bridge over a CSX railroad track, the Louisville and Nashville Railroad before intersecting U.S. Route 31W. KY 255 previously passed the ruins of Bells Tavern, and then intersected US 31W (Second Street) after a railroad crossing until 2012, when it was re-routed to go over the tracks via a new bridge on the west side of town. KY 255's concurrent run with US 31W lasts 0.16 miles (0.26 km), where KY 255 turns left onto Mammoth Cave Parkway. Its original concurrency with US 31W lasted for 0.2 miles (0.32 km).
KY 255 branches north, going 0.4 miles (0.64 km) before intersecting with Interstate 65 at its Exit 48 interchange. After this intersection, KY 255 continues in a northwesterly path and enters Mammoth Cave National Park, which is 0.4 miles (0.64 km) north of the Interstate. It proceeds north for another 0.9 miles, passing Diamond Caverns before entering the far eastern portion of Edmonson County and reaching its first intersection with KY 70 in the southern part of the park. At that point KY 255 joins KY 70 by making a right turn and it re-enters Barren County. This concurrency lasts for 1.666 miles (2.681 km) before reaching an intersection where KY 255 turns left, while KY 70 turns right to head for Cave City. This was KY 255's original northern terminus from the 1930s until sometime in the mid 1970s. KY 255's current northern terminus is located near the Sand Cave Trail at another entry into the Mammoth Cave National Park. That point marks the end of state maintenance. The road itself, however continues into the park, and ends at another intersection with the Mammoth Cave Parkway just south of the park's visitor center. This road was part of the original KY 70 alignment within the park until it was rerouted to its current in-park alignment in the 1970s.
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