The Study Alignments and Design Levels Technical Memorandum identifies study corridors and design levels for the 3rd Infantry Division Highway corridors, along with supporting justification and the rationale for the recommendations. Four study corridors were developed by a team of design professionals to follow existing roadways where practical, to avoid major national resources (e.g. National Wildlife Refuges and National Parks) and major waterways to the extent possible, and to incorporate Expert Working Group input while connecting the metropolitan areas identified in the statutory language.
Mile-wide conceptual corridors were identified between control points, as shown on the corridor map. The Study Alignments and Design Levels Technical Memorandum describes how corridors were developed and screened to identify a subset that will advance for cost estimation in the next task. Costs will be estimated for an Interstate, an arterial, and an enhanced two-lane highway for any corridors passing the "fatal flaw" screening.
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Three corridors have been suggested by members of the public through the project website. Alternatives suggested by the public will be presented and evaluated in the final study report.