Run-off-road traffic crashes account for almost one-third of the deaths and serious injuries each year on U.S. highways.
The TRB National Cooperative Highway Research Program's NCHRP Web-Only Document 296: Guidelines for Cost-Effective Safety Treatments of Roadside Ditches provides new proposed design guidance for the configuration of ditches adjacent to the roadway.
A supplemental PowerPoint Summary is available.
National Academies of Sciences, Engineering, and Medicine. 2021. Guidelines for Cost-Effective Safety Treatments of Roadside Ditches. Washington, DC: The National Academies Press. https://doi.org/10.17226/26127.
Chapters | skim | |
---|---|---|
FRONT MATTER | 1-3 | |
CONTENTS | 4-12 | |
SUMMARY | 13-14 | |
CHAPTER 1. INTRODUCTION AND BACKGROUND | 15-47 | |
CHAPTER 2. RESEARCH APPROACH | 48-49 | |
CHAPTER 3. SURVEY OF STATES | 50-57 | |
CHAPTER 4. ANALYSIS OF EXISTING CRASH DATA | 58-89 | |
CHAPTER 5. BENEFIT-COST ANALYSIS METHODS | 90-106 | |
CHAPTER 6. SIMULATION ANALYSIS METHODS | 107-148 | |
CHAPTER 7. SIMULATION SCENARIOS AND RESULTS | 149-161 | |
CHAPTER 8. EVALUATION OF DITCH DESIGN VARIABLES | 162-208 | |
CHAPTER 9. EVALUATION OF POTENTIAL MITIGATION METHODS | 209-226 | |
CHAPTER 10. GUIDELINE DEVELOPMENT | 227-239 | |
CHAPTER 11. SUMMARY AND CONCLUSIONS | 240-241 | |
REFERENCES | 242-245 | |
APPENDIX A. MATHEMATICAL DESCRIPTION OF THE BENEFIT-COST ANALYSIS METHOD | 246-259 | |
APPENDIX B. CARSIM WRAPPER PROGRAM USERS GUIDE | 260-264 | |
APPENDIX C. SIMULATION OUTCOMES | 265-267 | |
APPENDIX D. PROPOSED GUIDELINES | 268-281 |
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