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The variety of median widths and terrains combined with evolving testing specifications and lack of conclusive data on median crossover crashes have been obstacles to developing median barrier guidance.

The TRB National Cooperative Highway Research Program's NCHRP Research Report 996: Selection and Placement Guidelines for Test Level 2 Through Test Level 5 Median Barriers develops, in a format suitable for consideration and possible adoption by AASHTO, proposed guidelines for the selection and placement of Manual for Assessing Safety Hardware (MASH) Test Levels 2 through 5 (TL2-TL5) median barriers.

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Suggested Citation

National Research Council. 2022. Selection and Placement Guidelines for Test Level 2 Through Test Level 5 Median Barriers. Washington, DC: The National Academies Press. https://doi.org/10.17226/26679.

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Publication Info

178 pages |  8.5 x 11 |  DOI: https://doi.org/10.17226/26679
Chapters skim
Front Matter i-viii
Chapter 1 - Introduction 1-1
Chapter 2 - Definitions 2-2
Chapter 3 - Literature Review 3-32
Chapter 4 - Methodology 33-40
Chapter 5 - Guidelines 41-56
Chapter 6 - Conclusions 57-58
References 59-61
Abbreviations 62-64
Appendix A - Survey of States 65-72
Appendix B - Probability of Reaching the Lateral Offset of Feature j PY(Yj) 73-108
Appendix C - Probability of Crash Severity (PSEVj) 109-144
Appendix D - Probability of Passing Through, Over, or Under a Barrier (THRBAR) 145-152
Appendix E - Probability of Passing Across the Opposing Lanes (THREOL) 153-172

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