southbound
adj. B1 Intermediate US //ˈsaʊθˌbaʊnd// UK //sˈaʊθbaʊnd// south·bound
adj. moving or leading toward the south. You use this to describe a road, a train, or a person traveling in that direction.
adj. moving, leading, or facing toward the south. Often used attributively before a noun or predicatively after a linking verb.
We are currently on the southbound train.
Heavy traffic is building up on the southbound lanes of the highway due to construction.
The migratory birds began their southbound journey as the first signs of autumn appeared in the northern forests.
From south + -bound.
Usage
Typically placed before the noun it modifies, though it can follow a linking verb like 'be' or 'head'.