From Halopedia, the Halo wiki
Breakneck is a multiplayer map included in Halo: Combat Evolved Anniversary for Halo: Reach. It is a remake of Headlong from Halo 2. It is the only Halo: Reach multiplayer map to be set on Earth.
Universe and lore
Like its predecessor, Breakneck is set in the city of New Mombasa, in a part of the docks known as Section 21, which closely resembles the Section 14 featured in Headlong. The area is lined by buildings on all but one side, which opens up to the sea with a view of a structure resembling the Uplift Nature Reserve and the city center. The playable area is dominated by a large construction site, with a skyscraper and an elevated road under construction.
The New Mombasa Superintendent's avatar can be seen on many parts of the map. The advertisement for the civilian Hog still appears on this map, with the billboard retaining its original position on the map, in the left corner of the incomplete building's rear side.
The following are locations on the map that are so named on the player's heads-up display during gameplay: