From The Collaborative International Dictionary of English v.0.48:

northbound \northbound\ adj.
   1. Moving toward the north; as, northbound traffic.

   Syn: northward.
        [WordNet 1.5]

   2. intended to be used by vehicles moving toward the north;
      -- of roads and parts of roads; as, The northbound lane
      was blocked by an overturned tractor-trailer.
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