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CHAPTER 5 Conclusions and Recommendations This study conducted a detailed review of the experience and analysis of truck-only lanes in the United States and internationally. The objectives of the study included the following: Develop a compendium of information about the technical and institutional issues associated with applications of truck-only lanes so that practitioners can make better informed judgments and evaluations of potential costs and benefits of truck-only lanes. This compendium was pre- pared, to a large extent, in the interim report for this study. Key issues and findings of this compendium are summarized in the next section of this chapter, and the entire contents of the compendium are presented in Appendix A. Conduct a performance evaluation of different truck-only lane configurations and applications to assess the potential benefits and performance issues that arise. This performance evaluation was intended to illustrate the key performance metrics and methodologies for conducting the per- formance evaluation of truck-only lanes and to suggest the configurations and applications in which truck-only lanes are most likely to provide the greatest benefits. In addition, an objective of the study was to evaluate how potential costs of truck-only lanes relate to the benefits, and how these compare against the benefits and costs of other types of highway system investments (such as adding mixed-flow capacity). Chapters 3 and 4 of this report presented the results of the per- formance evaluations and B-C analyses of truck-only lanes. Since this project did not have the resources to conduct new research, the performance evaluations conducted in Chapter 3 relied on published data primarily from feasibility studies and very limited field observations. Data gath- ered from these sources also served as key inputs in the B-C analyses of truck-only lanes. Suggest areas of future research to improve understanding of the performance of truck-only lanes in various applications. Clearly, the lack of actual field data from which to draw conclusions is a major obstacle to completing the types of evaluations that would be desirable, and the final sec- tion of this chapter provides some ideas on how this issue might be addressed. In addition, this chapter suggests some ideas for future research programs and analyses that go beyond what was feasible in this project. This study determined that there is substantial recent interest in applications of truck-only lanes in the following types of applications: Long-haul intercity corridors, Major urban corridors with high volumes of truck traffic, and Major corridors providing access to ports and intermodal terminals. As noted several times in this report, there are no actual examples of truck-only lanes in the applications that were identified in the literature review. The closest examples to any of these appli- cations identified are in Rotterdam, Netherlands, where nonseparated and barrier-separated lanes for trucks have been implemented along the A-16 (5.5 km/3.4 mi) and A-20 (2.4 km/1.5 mi) motorways, respectively. These lanes can be considered to be representative of truck-only lane 78