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Performance Criteria for Retroreflective Pavement Markers (2022)

Chapter: Appendix A - Curve Study Exhibits

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Suggested Citation:"Appendix A - Curve Study Exhibits." National Academies of Sciences, Engineering, and Medicine. 2022. Performance Criteria for Retroreflective Pavement Markers. Washington, DC: The National Academies Press. doi: 10.17226/26814.
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Suggested Citation:"Appendix A - Curve Study Exhibits." National Academies of Sciences, Engineering, and Medicine. 2022. Performance Criteria for Retroreflective Pavement Markers. Washington, DC: The National Academies Press. doi: 10.17226/26814.
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Suggested Citation:"Appendix A - Curve Study Exhibits." National Academies of Sciences, Engineering, and Medicine. 2022. Performance Criteria for Retroreflective Pavement Markers. Washington, DC: The National Academies Press. doi: 10.17226/26814.
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Suggested Citation:"Appendix A - Curve Study Exhibits." National Academies of Sciences, Engineering, and Medicine. 2022. Performance Criteria for Retroreflective Pavement Markers. Washington, DC: The National Academies Press. doi: 10.17226/26814.
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Suggested Citation:"Appendix A - Curve Study Exhibits." National Academies of Sciences, Engineering, and Medicine. 2022. Performance Criteria for Retroreflective Pavement Markers. Washington, DC: The National Academies Press. doi: 10.17226/26814.
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Suggested Citation:"Appendix A - Curve Study Exhibits." National Academies of Sciences, Engineering, and Medicine. 2022. Performance Criteria for Retroreflective Pavement Markers. Washington, DC: The National Academies Press. doi: 10.17226/26814.
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Suggested Citation:"Appendix A - Curve Study Exhibits." National Academies of Sciences, Engineering, and Medicine. 2022. Performance Criteria for Retroreflective Pavement Markers. Washington, DC: The National Academies Press. doi: 10.17226/26814.
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Suggested Citation:"Appendix A - Curve Study Exhibits." National Academies of Sciences, Engineering, and Medicine. 2022. Performance Criteria for Retroreflective Pavement Markers. Washington, DC: The National Academies Press. doi: 10.17226/26814.
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Suggested Citation:"Appendix A - Curve Study Exhibits." National Academies of Sciences, Engineering, and Medicine. 2022. Performance Criteria for Retroreflective Pavement Markers. Washington, DC: The National Academies Press. doi: 10.17226/26814.
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Suggested Citation:"Appendix A - Curve Study Exhibits." National Academies of Sciences, Engineering, and Medicine. 2022. Performance Criteria for Retroreflective Pavement Markers. Washington, DC: The National Academies Press. doi: 10.17226/26814.
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Suggested Citation:"Appendix A - Curve Study Exhibits." National Academies of Sciences, Engineering, and Medicine. 2022. Performance Criteria for Retroreflective Pavement Markers. Washington, DC: The National Academies Press. doi: 10.17226/26814.
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Suggested Citation:"Appendix A - Curve Study Exhibits." National Academies of Sciences, Engineering, and Medicine. 2022. Performance Criteria for Retroreflective Pavement Markers. Washington, DC: The National Academies Press. doi: 10.17226/26814.
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Suggested Citation:"Appendix A - Curve Study Exhibits." National Academies of Sciences, Engineering, and Medicine. 2022. Performance Criteria for Retroreflective Pavement Markers. Washington, DC: The National Academies Press. doi: 10.17226/26814.
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Suggested Citation:"Appendix A - Curve Study Exhibits." National Academies of Sciences, Engineering, and Medicine. 2022. Performance Criteria for Retroreflective Pavement Markers. Washington, DC: The National Academies Press. doi: 10.17226/26814.
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Suggested Citation:"Appendix A - Curve Study Exhibits." National Academies of Sciences, Engineering, and Medicine. 2022. Performance Criteria for Retroreflective Pavement Markers. Washington, DC: The National Academies Press. doi: 10.17226/26814.
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Suggested Citation:"Appendix A - Curve Study Exhibits." National Academies of Sciences, Engineering, and Medicine. 2022. Performance Criteria for Retroreflective Pavement Markers. Washington, DC: The National Academies Press. doi: 10.17226/26814.
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149   Curve Study Exhibits A P P E N D I X A Treatment Matrices Table A-1. Odd-Day Curve Treatment Matrix. Lap 1 Curve # Spacing (ft) Glare Direction Scenario Number Retro Level 1 40 Right A Low 2 40 Right A Low 3 NA Right A None 1 40 Right A Low 4 20 Right A Low 5 40 Yes Veh#1 Right A Medium 6 40 Right A Medium Lap 2 Curve # Spacing (ft) Glare Direction Scenario Number Retro Level 6 40 Left A Low 5 40 Yes Veh#2 Left A Obscured 4 20 Left A Medium 1 40 Left A Medium 3 NA Left A None 2 40 Left A Medium 1 40 Left A Medium Lap 3 Curve # Spacing (ft) Glare Direction Scenario Number Retro Level 1 40 Right B Medium 2 NA Right B None 3 40 Right B High 1 40 Right B Medium 4 20 Right B Medium 5 40 Yes Veh#1 Right B Medium 6 40 Right A Medium Lap 4 Curve # Spacing (ft) Glare Direction Scenario Number Retro Level 6 40 Left A Low 5 40 Yes Veh#2 Left B Obscured 4 20 Left B Low 1 40 Left B Low 3 40 Left B High 2 NA Left B None 1 40 Left B Low

150 Performance Criteria for Retroreflective Pavement Markers Table A-2. Even-Day Curve Treatment Matrix. Lap 1 Curve # Spacing (ft) Glare Direction Scenario Number Retro Level 1 40 Right B Medium 2 40 Right A Medium 3 NA Right A None 1 40 Right B Medium 4 20 Right B Medium 5 40 Yes Veh#1 Right C None 6 40 Right B Low Lap 2 Curve # Spacing (ft) Glare Direction Scenario Number Retro Level 6 40 Left B Medium 5 40 Yes Veh#2 Left C Medium 4 20 Left B Low 1 40 Left B Low 3 NA Left A None 2 40 Left A Low 1 40 Left B Low Lap 3 Curve # Spacing (ft) Glare Direction Scenario Number Retro Level 1 40 Right A Low 2 NA Right B None 3 40 Right B High 1 40 Right A Low 4 20 Right A Low 5 40 Yes Veh#1 Right D Obscured 6 40 Right B Low Lap 4 Curve # Spacing (ft) Glare Direction Scenario Number Retro Level 6 40 Left B Medium 5 40 Yes Veh#2 Left D Medium 4 20 Left A Medium 1 40 Left A Medium 3 40 Left B High 2 NA Left B None 1 40 Left A Medium

Curve Study Exhibits 151   Treatment Images Figure A-1. Curve 1, Laps 1 and 3, Medium-Retro RPMs. Figure A-2. Curve 1, Laps 1 and 3, Low-Retro RPMs.

152 Performance Criteria for Retroreflective Pavement Markers Figure A-3. Curve 1, Laps 2 and 4, Medium-Retro RPMs. Figure A-4. Curve 1, Laps 2 and 4, Low-Retro RPMs.

Curve Study Exhibits 153   Figure A-5. Curve 2, Laps 1 and 3, Medium-Retro RPMs. Figure A-6. Curve 2, Laps 1 and 3, Low-Retro RPMs.

154 Performance Criteria for Retroreflective Pavement Markers Figure A-7. Curve 2, Laps 2 and 4, Medium-Retro RPMs. Figure A-8. Curve 2, Laps 2 and 4, Low-Retro RPMs.

Curve Study Exhibits 155   Figure A-9. Curve 3, Laps 1 and 3, High-Retro RPMs. Figure A-10. Curve 3, Laps 2 and 4, High-Retro RPMs.

156 Performance Criteria for Retroreflective Pavement Markers Figure A-11. Curve 4, Laps 1 and 3, Medium-Retro RPMs. Figure A-12. Curve 4, Laps 1 and 3, Low-Retro RPMs.

Curve Study Exhibits 157   Figure A-13. Curve 4, Laps 2 and 4, Medium-Retro RPMs. Figure A-14. Curve 4, Laps 2 and 4, Low-Retro RPMs.

158 Performance Criteria for Retroreflective Pavement Markers Figure A-15. Curve 5, Laps 1 and 3, Medium-Retro RPMs. Figure A-16. Curve 5, Laps 1 and 3, Obscured RPMs.

Curve Study Exhibits 159   Figure A-17. Curve 5, Laps 2 and 4, Medium-Retro RPMs. Figure A-18. Curve 5, Laps 2 and 4, Obscured RPMs.

160 Performance Criteria for Retroreflective Pavement Markers Figure A-19. Curve 6, Laps 1 and 3, Medium-Retro RPMs. Figure A-20. Curve 6, Laps 1 and 3, Low-Retro RPMs.

Curve Study Exhibits 161   Figure A-21. Curve 6, Laps 2 and 4, Medium-Retro RPMs. Figure A-22. Curve 6, Laps 2 and 4, Low-Retro RPMs.

162 Performance Criteria for Retroreective Pavement Markers Speed Profiles Figure A-23. Curve 1 Speed Profile. Figure A-24. Curve 2 Speed Profile. Distance To PC (ft) Distance To PC (ft)

Curve Study Exhibits 163   Figure A-25. Curve 4 Speed Profile. Figure A-26. Curve 5 Speed Profile. Distance To PC (ft) Distance To PC (ft)

164 Performance Criteria for Retroreective Pavement Markers Figure A-27. Curve 6 Speed Profile. Distance To PC (ft) Distance To PC (ft)

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Pavement markings are the most common traffic control device (TCD) used to communicate roadway information to drivers. To be effective, they must convey information in all lighting and weather conditions. As a result, pavement markings on public roads contain retroreflective elements, such as glass beads, so that light from vehicle headlights is returned to the eye of the driver at night.

The TRB National Cooperative Highway Research Program's NCHRP Research Report 1015: Performance Criteria for Retroreflective Pavement Markers seeks to isolate and identify the effects of retroreflective pavement markers (RPMs) from a cohesive, three-pronged investigation of driver visibility, behavior, and safety.

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