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U.S. Route 27 in Tennessee
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U.S. Route 27 in Tennessee

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U.S. Route 27 in Tennessee

U.S. Route 27 (US 27) in Tennessee runs from the Georgia state line in Chattanooga to the Kentucky state line in Isham. It forms the informal border between the Eastern and Central timezones of the state. It stays, however, in the Eastern Time Zone.

US 27 enters Tennessee from Rossville, Georgia, in Hamilton County as a four-lane highway, concurrent with both State Route 27 (SR 27) and SR 29. The route goes north as Rossville Boulevard, going through suburbs and passing by several businesses before entering Chattanooga and coming to an interchange with Interstate 24 (I-24; exits 180A–B) and briefly running concurrently with the Interstate, having interchanges with SR 58 (Market Street) and US 11/US 41/US 64/US 72/SR 2, before splitting off as a freeway (exit 178).

Beginning at I-24 and ending at SR 111, the route is a controlled-access highway for approximately 24 miles (39 km). The highway goes north as a narrow four-lane freeway (concurrent with unsigned I-124) through downtown and has interchanges with West Main Street (exit 1), Martin Luther King Boulevard (exits 1A–B; unsigned SR 316), and Fourth Street (exit 1C; unsigned SR 389) before crossing the Tennessee River on the Olgiati Bridge, where it widens to eight lanes and unsigned I-124 ends. It then has interchanges with Manufacturer's Road and Dayton Boulevard (Old US 27; unsigned SR 8) before crossing Stringer's Ridge to have an interchange with the national southern terminus of US 27's only auxiliary route, US 127, which is where SR 27 splits off to go north on that route. From here, the route is part of Corridor J of the Appalachian Development Highway System. US 27/SR 29 then narrow to six lanes and runs on top of a ridge while passing through Red Bank, where it has interchanges with Morrison Springs Road (where it narrows to four lanes), Mountain Creek Road, SR 153 southbound, and Dayton Pike northbound (once again, the old route of US 27), before entering Soddy-Daisy. The route continues north with interchanges at Thrasher Pike and Harrison Lane before having an interchange at Sequoyah Access Road, the main route to the Sequoyah Nuclear Plant. It then has an interchange with SR 319 (Hixson Pike) before running along the Tennessee River to a massive interchange with SR 111, which splits off to the northwest for Dunlap, where the freeway ends. The freeway continues along SR 111.

US 27 continues as a four-lane divided highway through the small towns of Sale Creek and Graysville, where it intersects with SR 303, before crossing into Rhea County and reaching Graysville. The route then enters Dayton at the intersection with SR 378 (Market Street; Old US 27) and SR 60 (Hiwassee Highway). It bypasses downtown to the east and intersects SR 30. US 27 then has another intersection with SR 378 before it leaves Dayton and continues northward through Evensville before becoming concurrent with SR 68 and arriving at Spring City. It then has an interchange where SR 68 splits off to the west, while US 27 enters downtown and intersects with SR 302. It then leaves Spring City and continues north through farmland.

From here, US 27 enters Roane County and runs through Glen Alice before becoming concurrent with US 70/SR 1 and entering the city of Rockwood. They go straight through town, passing just east of downtown before US 70 splits to the east, taking SR 1 and SR 29 with it. US 27 then runs concurrently with SR 61 (which is signecept on I-40), as that highway begins here. US 27/SR 61 then pass through Cardiff, where they intersect with the short SR 382, which provides access to Roane State Community College. They then enter Harriman and pass through countryside before coming to an interchange with I-40 (exit 347). During this stretch, it forms part of the Harvey H. Hannah Memorial Highway and is signed as such. They then enter the South Harriman neighborhood and pass by several businesses and rejoin with SR 29 (Ruritain Road). They then cross the bridge over the Emory River to enter and pass through the historic downtown, intersecting with SR 328. Just beyond Harriman, near the DeArmond community, US 27/SR 29 then splits from SR 61 at an interchange, with the Harvey H. Hannah Memorial Highway following that route to the east. US 27/SR 29 then begin to ascend the Cumberland Plateau as it narrows to two lanes and continues northward across the plateau for its remaining 55 miles (89 km) or so in Tennessee.

In Morgan County, the highway passes through the rugged mountains of the Cumberland Plateau and has another intersection with SR 328 before ascending a ridge to enter Mossy Grove. It passes through Mossy Grove and has an intersection with Clayton Howard Road, which provides access to Lone Mountain State Forest. It then leaves the town and continues north to an intersection with Main Street (Old US 27 in downtown) just before entering Wartburg. US 27/SR 29 then widen to four lanes just before the intersection with SR 62 and becomes concurrent with that route. They go north, bypassing downtown to the east before leaving Wartburg at the intersection with Old Gobey Road, which heads off to Gobey. The highway then descends a mountain and narrows to two lanes once again just before another crossing of the Emory River. They then have an intersection with Gobey Road, another access road to Gobey, before SR 62 splits off to the west. US 27/SR 29 then becomes narrow, curvy, and winding as it passes through rural areas. The highway passes by the Morgan County fairgrounds before passing through the town of Annadel. It does not have any passing lanes before entering the town of Sunbright. US 27/SR 29 passes through the center of town, having Intersections with SR 329 and Burrville Road, an access road to Burrville. It then becomes even curvier as it leaves Morgan County to cross into Scott County. For the next 12 miles (19 km) it is one place to pass with a 40 mph (64 km/h) speed limit. US 27/SR 29 then passes through the community of Glenmary before entering Elgin, where the highway intersects SR 52, which connects the area with the historic village of Rugby and Fentress County to the west.

Beyond Elgin, US 27/SR 29 passes through Robbins, the county seat of Huntsville (where it intersects with SR 63, becomes concurrent with SR 297, and widens to four lanes), and Helenwood before reaching the city of Oneida.

In Oneida, the highway passes through a major business district before narrowing to two lanes again before entering downtown and having an intersection with SR 456 just before passing by Big South Fork Medical Center. SR 297 then splits off to the west in the center of town, which provides access to the Big South Fork National River and Recreation Area. US 27/SR 29 then passes through the rest of downtown before leaving Oneida and passes through Winfield, the last sizable town that US 27 passes through in Tennessee before it reaches the community of Isham on the Kentucky border, where SR 29 ends and US 27 continues north into McCreary County.

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Numbered Highway in Tennessee, United States
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