u.s. route 27 business (us 27 bus.) is a business route of us 27 that partially exists in the city limits of buchanan, georgia. it is concurrent with state route 1 business (sr 1 bus.) for its entire length. us 27 bus./sr 1 bus. begins at an intersection with us 27/sr 1 southeast of buchanan. here, the roadway continues as hilltop drive. the business routes travel to the northwest, paralleling some railroad tracks of the norfolk southern railway. they enter buchanan and curve to the north-northwest. after intersecting sr 120, it travels on a bridge over the railroad tracks, which switch to the west side of the business routes. they travel just to the west of buchanan primary school and buchanan elementary school and just to the east of the buchanan city cemetery. they leave buchanan and curve to the north-northeast before reaching their northern terminus, a second intersection with us 27/sr 1 north of the city. the entire length of us 27 bus./sr 1 bus. is part of the national highway system, a system of routes determined to be the most important for the nation's economy, mobility, and defense.