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The 1st Edition, in 2010, of the AASHTO Highway Safety Manual revolutionized highway engineering practice by providing crash modification factors and functions, along with methods that use safety performance functions for estimating the number of crashes within a corridor, subsequent to implementing safety countermeasures.

The TRB National Cooperative Highway Research Program's NCHRP Research Report 974: Application of Crash Modification Factors for Access Management, Volume 2: Research Overview documents the research process related to access management features. The research project is also summarized in this presentation.

NCHRP Research Report 974: Application of Crash Modification Factors for Access Management, Volume 1: Practitioner’s Guide presents methods to help transportation practitioners quantify the safety impacts of access management strategies and make more informed access-related decisions on urban and suburban arterials.

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Suggested Citation

National Academies of Sciences, Engineering, and Medicine. 2021. Application of Crash Modification Factors for Access Management, Volume 2: Research Overview. Washington, DC: The National Academies Press. https://doi.org/10.17226/26162.

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Publication Info

390 pages |  8.5 x 11 |  DOI: https://doi.org/10.17226/26162
Chapters skim
Front Matter i-viii
Summary 1-5
Chapter 1 - Introduction 6-9
Chapter 2 - Literature Review 10-39
Chapter 3 - Data Reconnaissance and Assessment 40-55
Chapter 4 - Gap Analysis 56-64
Chapter 5 - Study Design 65-69
Chapter 6 - Data Collection 70-80
Chapter 7 - Analysis Results 81-160
Chapter 8 - Practitioner s Guide 161-164
Chapter 9 - Focus Group 165-168
Chapter 10 - Implementation Plan 169-172
Chapter 11 - Conclusions and Future Research 173-175
Appendix A - Survey Questions 176-177
Appendix B - Comments on Survey Responses 178-181
Appendix C - Overview of Goodness-of-Fit Measures 182-188
References 189-191
Abbreviations 192-196

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