west ‧ bound /ˈwestbaʊnd/ BrE AmE adjective
[ Word Family: adjective : ↑ west , ↑ westerly , ↑ western , ↑ westbound , ↑ westernized , ↑ westward ; noun : ↑ west , ↑ western , westerner, ↑ westerly , ↑ westernization ; adverb : ↑ west , westward(s); verb : ↑ westernize ]
travelling or leading towards the west:
Westbound traffic is moving very slowly.
an accident on the westbound carriageway of the motorway