Tsavo Highway

Tsavo Highway is the third campaign mission of Halo 3.

Upon completing it on the Normal, Heroic, or Legendary difficulties, the player will earn the "The Road" achievement and 20 Gamerpoints.

Background
It starts with SPARTAN-117 in a ruined UNSC base outside of Voi, who mounts a Troop Transport Warthog and skirts by the destroyed New Mombasa Space Elevator, and then reaches Tsavo Highway, encountering blockades of occupying Covenant Loyalist Brutes, Jackals, and Grunts, until reaching the terminus: the Ark, where Covenant Cruisers vaporize the surface of the Earth, unveiling the Ark.

Trivia
Tsavo is a region of Kenya close to where the Tsavo and Athi rivers meet and was the place where the Uganda Railway passed over the Tsavo river. There is a chance that a bridge will be encountered at one point.