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TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 431: Practices to Manage Traffic Sign Retroreflectivity includes examples of practices that illustrate how different types of transportation agencies might meet federal retroreflectivity requirements for traffic signs.

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Suggested Citation

National Academies of Sciences, Engineering, and Medicine. 2012. Practices to Manage Traffic Sign Retroreflectivity. Washington, DC: The National Academies Press. https://doi.org/10.17226/14663.

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Publication Info

44 pages |  8.5 x 11 |  DOI: https://doi.org/10.17226/14663
Chapters skim
Front Matter i-vii
Summary 1-2
Chapter One - Introduction 3-5
Chapter Two - Description of Sign Retroreflectivity Maintenance Methods 6-13
Chapter Three - Range of Practices 14-21
Chapter Four - Case Studies 22-26
Chapter Five - Effective Practices 27-28
Chapter Six - Research in Progress and Research Needs 29-29
Chapter Seven - Conclusions 30-30
References 31-31
Appendix A - Minimum Maintained Retroreflectivity Levels Resources 32-37
Appendix B - Telephone Survey 38-39
Appendix C - Survey Participants 40-42
Appendix D - Myths and Other Frequently Asked Questions 43-45

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