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Concept Development

Defining Concepts

Ideas

Through interviews, workshops, and public meetings, we heard many ideas for potential solutions. Certain suggestions we've received extend beyond the jurisdiction and authority of ITD. Those ideas are still recorded as part of the study, and we will share those ideas with other parties, which may include local cities, counties, and agencies. 

Concepts

Ideas generated that would solve some of the transportation challenges that fall within ITD's purview were tested with engineering best practices and technical data to create concepts. Simply put, concepts are proposed improvements to a transportation system. For these studies, concepts range from broad to targeted, rural to urban. As we move through each step of the process, concept details will be refined. Multiple reasonable concepts may advance and will be called alternatives if they are recommended at the conclusion of the study. ​

Options

Some concepts include multiple options. Think of options like ingredients in a recipe. We mix and match specific options to build a concept. Some options will be included in Level One Screening, but other options may develop as part of Level Two. Options may include:

  • Intersections

  • Routes

  • Roadway elements, such as turn lane or traffic signal

Concept Development Process​​

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Stakeholder and Public Ideas and Feedback
The community was invited to provide feedback on potential improvements, including their ideas on possible routes for realignment. These were provided through paper and online maps and comment forms. 

Planning Documents
Planning documents compiled during the initial data gathering were utilized for reference. This includes the ITD Original Corridor Plan, City of Moscow Plans, University of Idaho Long Range Plan, Latah County, Whitman County, and Washington State Department of Transportation planning documents. 

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GIS Route Finding
A geographic information system (GIS) route-finding tool calculated efficient paths for potential corridor concepts, taking into consideration many data sets and geospatial information. 

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Applied Engineering Practices
Data was synthesized from the stakeholder and public feedback, planning documents, and GIS route finding, and engineering practices were applied to develop as many viable routes as possible. This included traffic operations analysis, review of crash history and roadway safety, and assessment of existing roadway and intersection geometry. The foundation of this approach identified key locations to begin, end, and/or intersect US-95 and SH-8.

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