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3 1. Identify the data needs for addressing the specific objectives resentative ran-off-road crashes and the flexibility to con- of this study. A literature review was conducted on previous duct special studies on specific roadside safety features and studies involving in-depth crash data collection, impact devices. Data collection protocols for the continuous data conditions of ran-off-road crashes, data needs for study of collection and a selected special study were developed. Also, ran-off-road crashes, and reconstruction of ran-off-road a pilot program was conducted to demonstrate the feasibil- crashes. ity of the long-term data collection effort and to iron out the 2. Develop a work plan to collect the needed data. Various details and identify any potential problems. data collection alternatives were evaluated and a retrospec- tive supplemental data collection approach was selected for 1.4 Report Organization use with the current study. An appropriate data collection protocol was developed, including the sampling plan, data This report summarizes the results of the work conducted collection forms and field procedures, as well as manual under the study. Chapter 2 presents a summary of the literature review and reconstruction procedures. review and other ongoing and future research and data collec- 3. Conduct a retrospective supplemental data collection effort tion efforts. Chapter 3 outlines the study approach, including of approximately 400 crashes selected from the 2000 and data collection alternatives, data collection plan, and develop- 2001 NASS Crashworthiness Data System (CDS) data. ment of the database. Results of the analyses are presented in Supplemental field data were collected to gather additional Chapter 4. The proposed plan for a long-term data collection information about the crash sites and roadside features. effort is outlined in Chapter 5. Finally, a summary of the study In addition, these crashes were reconstructed to estimate findings and conclusions are presented in Chapter 6. the impact conditions, including speed, angle, and vehi- Some of the details too voluminous for the main body of the cle orientation. report are included as appendices. Appendix A presents the 4. Develop a relational database suitable for future research. critical review of individual references. Appendix B summa- The database was first developed with data from the cur- rizes the results of the analysis of the 1997-2001 NASS CDS rent study. Similar data from previous studies, including data, including the list of 2000 and 2001 cases to be sampled for NCHRP Project 17-11 and the Federal Highway Admin- supplemental field data collection. Appendix C outlines the istration (FHWA) Rollover Study, were then manually protocol for the supplemental field data collection and manual reviewed and reconstructed prior to incorporation into review used for the current study. The details of database ele- the database. ments are shown in Appendix D. Additional tables, plots, and 5. Analyze the database to address the specific objectives of analysis results too voluminous for the main report are shown this study, including identification of the vehicle types, in Appendix E. Finally, the field data collection forms and the impact conditions, and site characteristics associated with corresponding coding instructions and field procedures for serious and fatal crashes. the proposed long-term data collection effort are presented in 6. Develop a proposed implementation plan for a long-term Appendix F. These appendices are available from the NCHRP data collection effort. The implementation plan outlined a Report 665 blurb page on the TRB website (www.trb.org) by long-term effort to continue collecting detailed data on rep- searching for "NCHRP Report 665".