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NCHRP Report 524: Safety of U-Turns at Unsignalized Median Openings (2004)
National Cooperative Highway Research Program (NCHRP)

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Levinson, H S, Harwood, D W, Gluck, J S, Garvey, P M, Torbic, D J, Richard, K R, Potts, I B, Ghebrial, R S, Transportation Research Board. "Appendix B - Summary of Survey Responses From State and Local Highway Agencies." NCHRP Report 524: Safety of U-Turns at Unsignalized Median Openings. Washington, DC: The National Academies Press, 2004.

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Page
105
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Page
105
Front Matter (R1-R8)
Summary (1-2)
Organization of This Report (3-4)
Location of Median Openings (5-5)
Spacing of Median Openings (6-6)
Safety of Median Openings (7-7)
Median Width (8-9)
Safety Effects of Median Treatments (Raised/Depressed/Flush/TWLTL) (10-14)
Safety Effects of Increasing U-Turn Maneuvers Through Use of Nontraversable Medians (15-15)
Left-Turn Lanes (16-17)
Median Acceleration Lanes (18-19)
Sight Distance at Median Openings (20-20)
Indirect Left-Turn Maneuvers (21-23)
Access Management (24-24)
Spacing Between Access Points (25-25)
Effects of Adjacent Traffic Signals (26-26)
Location and Design of Median Openings (27-27)
Treatment of U-Turns at Median Openings (28-30)
Median and Roadway Widths to Accommodate U-Turn Maneuvers (31-31)
Mitigation Measures for Safety Problems (32-32)
Factors Used in Classification of Median Opening Designs (33-33)
Overview of Typical Median Opening Designs (34-41)
Factors That Influence the Safety and Operational Performance of Median Openings (42-51)
Relative Safety of Median Opening Designs Based on Traffic Conflict Points (52-52)
Combinations of Median Openings Along Arterial Streets (53-58)
Catalog of Existing Median Openings (59-61)
Data Collection and Analysis for Selected Median Openings (62-67)
Median Opening Accident Frequencies (68-68)
Median Opening Accident Rates (69-70)
Median Opening Conflict Rates (71-71)
Comparison of Median Opening Accident and Conflict Rates (72-73)
Combinations of Median Openings (74-78)
Conclusions (79-79)
Recommendations, (80-80)
References (81-82)
Appendix A - Highway Agency Survey Questionnaire (83-89)
Appendix B - Summary of Survey Responses From State and Local Highway Agencies (90-105)
Appendix C - Guidelines for the Use, Location, and Design of Unsignalized Median Openings (106-133)
Abbreviations used without definitions in TRB publications (134-134)