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NCHRP Report 674: Crossing Solutions at Roundabouts and Channelized Turn Lanes for Pedestrians with Vision Disabilities (2011)
National Cooperative Highway Research Program (NCHRP)

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Rodegerdts, Lee, Guth, David, Long, Richard, Bentzen, Billie Louise, Schroeder, Bastian, Emerson, Robert Wall, Hughes, Ronald, Rouphail, Nagui, Cunningham, Christopher, Salamati, Katy, Kim, Dae, Barlow, Janet, Myers, Ed, Transportation Research Board. "Appendix N - IRB Approval and Consent Forms." NCHRP Report 674: Crossing Solutions at Roundabouts and Channelized Turn Lanes for Pedestrians with Vision Disabilities. Washington, DC: The National Academies Press, 2011.

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Page
140
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Page
140
Front Matter (R1-R11)
Summary (1-9)
Safety Is Not Synonymous with Access (10-10)
Scope of Work (11-11)
Content of This Report (12-12)
Facility Design (13-14)
Locating the Crosswalk (15-15)
The U.S. Access Board and ADA (16-16)
Midblock Crossings and Conventional Intersections (17-18)
Blind Pedestrian Crossing Experiments (19-19)
Driver Information Treatments (20-20)
Crosswalk Geometric Modification (21-21)
Signalization Treatments with APS (22-22)
Grade-Separated Crossing (23-23)
Participants (24-24)
Participant Questionnaires (25-25)
Identification and Selection of Treatments (26-26)
Site Selection (27-27)
Selection of Treatment Sites (28-33)
Crossing Performance Characteristics (34-34)
Opportunity Utilization Criterion (35-35)
Event Definitions (36-36)
Performance Measures (37-38)
Performance Measure Example (39-39)
Research Hypotheses (40-42)
Crossing Performance Results (43-44)
Participant Feedback (45-45)
Impact on Vehicular Traffic (46-46)
Study Overview (47-47)
Crossing Performance Results (48-49)
Impact on Vehicular Traffic (50-50)
Crossing Performance Results (51-54)
Participant Feedback (55-55)
Compliance with Signal Indications (56-57)
Impact on Vehicular Traffic (58-58)
Summary of Results (59-61)
Introduction (62-62)
Results (63-66)
Model Comparison (67-68)
Model Application (69-72)
Extension to Safety Modeling (73-73)
Applying the Framework to Simulation (74-77)
Simulation-Based Analysis of Signalized Crosswalks (78-80)
Discussion (81-81)
Synthesis of Approach (82-82)
Implications of Field Study Results (83-84)
Policy Implications (85-85)
The Impact of Vehicle Speed (86-86)
Inter-Participant Variability (87-87)
Learning Effect and O&M Training (88-88)
Confidence in Decision-Making (89-89)
Viability of Interventions as a Measure of Risk (90-90)
Driver Yielding and Enforcement (91-91)
Channelized Turn Lanes (92-92)
Two-Lane Roundabouts (93-93)
Future Research Needs (94-96)
References (97-98)
Appendix A - Detailed Results (99-100)
Crossing Statistics for CTL Site and Treatments (101-107)
Channelized Turn Lane Results Summary (108-109)
Crossing Statistics for Crosswalk (110-114)
Golden, CO, Single-Lane Roundabout Summary (115-115)
Site Description (116-117)
Crossing Statistics (118-119)
Discussion (120-120)
Pretest Pedestrian Behavior at the RCW (121-122)
Posttest Pedestrian Behavior at the RCW (123-123)
Performance Statistics for RCW (124-126)
RCW Summary (127-127)
Pretest Pedestrian Behavior at the PHB Crosswalk (128-129)
Posttest Blind Pedestrian Behavior at the PHB Crosswalk (130-132)
Performance Statistics at the PHB Crosswalk (133-135)
Driver Behavior at the PHB (136-137)
PHB Crosswalk Summary (138-139)
Appendix N - IRB Approval and Consent Forms (140-140)
Abbreviations used without definitions in TRB publications (141-141)

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140 APPENDICES B THROUGH N Appendices B through N are available on the TRB website (www.trb.org) by searching "NCHRP Web-Only Document 160". Appendix B: Long List of Treatments Appendix C: Team Treatment Survey Appendix D: Details on Site Selection Appendix E: Details on Treatment and Site Descriptions Appendix F: Details on PHB Installation Appendix G: Participant Survey Forms Appendix H: Details on Team Conflict Survey Appendix I: Details on Simulation Analysis Framework Appendix J: Details on Accessibility Measures Appendix K: Details on Delay Model Development Appendix L: Details on Roundabout Signalization Modeling Appendix M: Use of Visualization in NCHRP Project 3-78A Appendix N: IRB Approval and Consent Forms