Examples from the Web for southbound
Southbound Route 95 congestion is expected to increase, so we recommend that drivers consider alternate routes.
With this incentive no automobilist north or southbound should omit San Gimignano or Volterra from his itinerary.Italian Highways and Byways from a Motor Car|Francis Miltoun
A few hours later we left Jersey City on the southbound flyer.The Statesmen Snowbound|Robert Fitzgerald
Thirty cars of a southbound Illinois Central freight train were blown from the track a mile north of the town.