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16 A Guidebook for Corridor-Based Statewide Transportation Planning Step Reason In states that have progressed to the point that 5. Create internal corridor planning results have been used to identify procedures and/or statewide priorities, a task force or advisory organizational means of committee has often been created to assess the prioritizing projects tradeoffs associated with different corridor resulting from corridor recommendations. Such an institutional capacity is studies. An also important for guiding the initial organizational center of implementation of the SWCP process in the state-- responsibility for the for example, by helping to establish goals and SWCP process should related evaluation criteria for later use in be clearly identified. decisionmaking. Establish a Corridor Network Step Reason As seen in most cases investigated for this project, the state corridor network identifies that set of corridors that meets some predetermined set of policy criteria. For example, those criteria could relate to the accessibility to economic activities, freight flows, freight and passenger volumes, evacuation routes, and national defense purposes. In some cases, it might be appropriate to establish a tiered system of candidate corridors. If so, the 6. Develop criteria for criteria for each tiered network should be clearly establishing a statewide delineated. In addition, the identification of the multimodal network of statewide multimodal network could have candidate corridors. important political consequences and, thus, should be undertaken in an open and transparent way, with opportunities provided for public involvement. Finally, corridors of statewide significance should be viewed from a multimodal perspective--that is, they should not be identified strictly as a highway corridor, rail corridor, transit corridor, and so forth. Even if funding strategies are constrained along modal lines, corridor needs should be identified for all the modes present in the corridor (e.g., the Florida example in Appendix A). This step is important to identify the corridors that meet the definition of "state significance" and, thus, are subject to increased state interest in investment. In many of the SWCP examples, a geographic 7. Utilize an appropriate information system (GIS) approach is used to analysis approach to identify those corridors that meet the combined delineate potential identification criteria. In other cases where the corridors or corridor identification criteria are not too complex (e.g., segments. minimum length of highway segment and threshold values of average annual daily traffic [AADT] and congestion levels), the candidate corridor network can be identified through very simple application of threshold analysis. To identify priority corridors (the next step in the process), a database should be developed that organizes the corridor performance and condition data in a consistent manner. For example, one 8. Develop a statewide should access or create a database that includes all corridor database. of the data available for all modes in the corridor network identification selection criteria. The data in this database should be monitored and updated periodically as needed to provide the most current data for future SWCP efforts.