sentences:  Southern Distributor Road
  
  The Southern Distributor Road (SDR) is a principal distributor road in Newport that runs from the Coldra roundabout (M4 junction 24) in the east of Newport to Tredegar Park M4 Junction 28) in the west of Newport and includes City Bridge, a bow-string arch bridge spanning the River Usk.Combined with the M4 in the north, the SDR forms the southern part of a ring road for the city.