Georgia State Route 155
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| Route information | ||||
| Maintained by GDOT | ||||
| Length: | 57.2 mi (92.1 km) | |||
| Major junctions | ||||
| South end: |
      US 19 / US 19 Bus. / US 41 / US 41 Bus. / SR 3 / SR 7 south of Griffin
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| North end: |
  US 23 / SR 13 in Brookhaven
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| Location | ||||
| Counties: | Spalding, Henry, Rockdale, DeKalb | |||
| Highway system | ||||
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State Route 155 (SR 155) is a 57.2-mile-long (92.1 km) state highway that travels south-to-north through portions of Spalding, Henry, Rockdale, and DeKalb counties in the north-central part of the U.S. state of Georgia.
SR 155 begins at an intersection with US 19/US 41/SR 3/SR 7 south of Griffin, in Spalding County. This also marks the southern terminus of US 19 Bus./US 41 Bus., which travel concurrently with SR 155 to the northeast to an intersection with SR 16 in the central part of the city. They cross a Norfolk Southern Railway until SR 155 departs to the east. It heads northeast, and turns north on McDonough Road. It heads northward and enters Henry County.
SR 155 meets Interstate 75 (I-75), just before it enters McDonough. In the city, it intersects US 23/SR 42. In the main part of the city is SR 20. The two highways travel concurrently for about a block. Then, SR 81 travels concurrent with it for a short distance. SR 155 departs to the north, and intersects SR 138 just before it reaches the Henry–Rockdale county line. It travels along the county line until just past Panola Mountain State Park, where it re-enters Henry County for a short distance. After that, it enters DeKalb County.
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