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Coastal Highway is an achievement in Halo 3: ODST and Halo: The Master Chief Collection. It is obtained when the player completes Coastal Highway at least on normal difficulty in Campaign Mode and unlocks the map Last Exit for Firefight. It is worth 50 Gamerpoints.
It is represented by an olive circle, with the Marathon symbol imprinted in it, with a Waste Disposal Elephant in front of it.