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September 11, 2021 <br />Page 44 <br />Step 3: Develop Improvement Concepts <br />The third step in the concept development process was to package feasible improvements into <br />improvement concepts that could be evaluated for regional traffic impacts and cost effectiveness. <br />This step produced four improvement concepts — two concepts comprised of improvements to <br />existing highways, and two concepts that included a new river crossing following the <br />Zanzibar/Armstrong alignment. Concepts comprised of improvements to existing highways were <br />developed to assess improvement in north -south traffic movements relative to the option of <br />building a new river crossing. <br />The Northwest Metro Mississippi River Crossing Feasibility Analysis concepts were identified as <br />follows: <br />• Concept 1: Mobility improvements on Highway 10 and Highway 101 <br />• Concept 2: Mobility improvements on Highway 10, Highway 101, and Highway 610 <br />• Concept 3: Arterial Mississippi River crossing following the Zanzibar/Armstrong alignment <br />• Concept 4: Expressway Mississippi River crossing following the Zanzibar/Armstrong alignment <br />Northwest Metro Mississippi River Crossing Feasibility Analysis <br />