southbound

adjective
  1. 1

    Which is (or will be) travelling south.

    โ€œWe took the southbound train to Barcelona.โ€

adverb
  1. 1

    Toward the south.

    โ€œThe truck raced southbound, then careened into the ditch.โ€

Source: https://en.wiktionary.org/wiki/southbound