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TRB’s National Cooperative Highway Research Program (NCHRP) Report 633: Impact of Shoulder Width and Median Width on Safety explores crash prediction models and accident modification factors for shoulder width and median width on rural four-lane roads.

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Suggested Citation

National Academies of Sciences, Engineering, and Medicine. 2009. Impact of Shoulder Width and Median Width on Safety. Washington, DC: The National Academies Press. https://doi.org/10.17226/14252.

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Publication Info

37 pages |  8.5 x 11 |  DOI: https://doi.org/10.17226/14252
Chapters skim
Front Matter i-viii
Summary 1-6
Chapter 1 - Introduction and Research Approach 7-8
Chapter 2 - Literature Review 9-16
Chapter 3 - Data Analysis 17-26
Chapter 4 - Design Elements Recommendations 27-31
Chapter 5 - Conclusions and Suggested Research 32-33
References 34-35
Appendix A - Using Prediction Models to Determine Relative Safety of Design Element Choices 36-37
Abbreviations used without definitions in TRB publications 38-38

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