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The width of a recovery area varies with design speed, traffic volumes, and slope configurations. A traversable and recoverable clear zone indicate thereA clear zone is the unobstructed, traversable area provided beyond the edge of the through traveled way for the recovery of errant vehicles. The clear zone Highway Design Manual. 300-1. July 1, 2020. CHAPTER 300 – GEOMETRIC CROSS. SECTION See Index 309.1(2) for information on clear recovery zones.