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Guidebook Organization and Purpose 5 statewide transportation plan. Some states prepare a policy-based statewide transportation plan, while others prepare a project-based plan that is compatible with projected funding. Some states update their statewide plans with a well-defined continuous planning effort every 2 to 4 years, while others update only when it is required by federal law. Some statewide transportation plans are developed almost exclusively by state transportation agencies. Others rely heavily on regional planning agencies to identify individual projects and strategies that are most relevant in their particular jurisdiction, which are, in turn, considered by the state and compiled into a statewide strategy for transportation actions or investment. Over the past 10 to 15 years, another model for conducting multimodal statewide transportation planning has been evolving. This model, based on an SWCP approach, relies on the identification of significant state transportation corridors and the results of individual corridor plans to provide a more detailed and comprehensive perspective on the transportation needs in corridors that are designated as being of significance to the state. The statewide plans and programs are then developed based on the aggregated results of individual corridor analysis. Recognition of and authority for a corridor or sub-area planning approach to the statewide transportation planning process has been included in federal regulations under 23 CFR 450.212. Purpose The Guidebook's purpose is to guide transportation decisionmakers, agency managers, and transportation planners on how to conduct a statewide transportation planning process with a focus on corridors of regional, statewide, or interstate significance. This guidebook does not provide guidance on how to conduct corridor studies. The reader is referred to several other reports and technical guidance that have been produced on this particular topic--for example: NCHRP Report 404: Innovative Practices for Multimodal Transportation Planning for Freight and Passengers (1998) and NCHRP Report 435, Guidebook for Transportation Corridor Studies: A Process for Effective Decision-Making (1999). It is assumed that planning practitioners are familiar with the basic approach to developing individual corridor plans. The primary intent of this guidebook is to describe a strategic approach for using the results of corridor plans in developing a statewide transportation plan. Overview The Guidebook was developed using information obtained from a literature review and from a national survey and case studies of state DOTs and metropolitan planning organizations (MPOs) with a corridor-based transportation systems approach to long-range planning. The guidebook provides recommendations on steps for the implementation of an SWCP process in a state. According to state DOTs that develop a corridor-based statewide transportation plan, SWCP provides the following advantages over a systems-wide or project-based planning process: More direct connection between the movement of people and goods and state-significant economic activity; Better analysis of trade-offs among different modes of transportation; Higher precision in monitoring transportation system performance; More complete investigation of non-transportation strategies;

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6 A Guidebook for Corridor-Based Statewide Transportation Planning Better cost estimates for the Statewide Transportation Improvement Program (STIP); Institutionalized consideration of major multi-state corridors; A process that is already familiar to planning partners; and More effective involvement of local officials and other stakeholders. The major steps recommended for a successful SWCP process include the following: 1. Establish organizing principles and institutional structure. 2. Establish a corridor network. 3. Identify study corridors. 4. Conduct corridor studies or analysis: Identification of vision, goals, and performance measures; Problem identification; Alternatives identification and analysis; Project and corridor evaluation; and Project and corridor investment program. 5. Identify statewide investment program and system management strategies. Technical guidance for each of these steps is provided in Section 3, and application of the technical guidance is illustrated in Section 4 for the hypothetical state of South Orange. Some key decisions include the selection of significant corridors, the level of detail that will be provided in the corridor analysis, and the application of the corridor to the identification and prioritization of the final recommendations. For example, a cursory analysis could be used to define corridors or to identify categories of transportation problems, or a state DOT could use more detailed methods--whether for the criteria to identify corridors, corridor studies to identify needs, or the decisionmaking process to identify projects, strategies, or priorities. In any case, the concept of a statewide transportation planning process based on corridors is a useful way of incorporating a more detailed and structured foundation for the statewide transportation planning process and STIP process.