NCHRP Report 674: Crossing Solutions at Roundabouts and Channelized Turn Lanes for Pedestrians with Vision Disabilities
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NCHRP Report 674:
Crossing Solutions at Roundabouts and Channelized Turn Lanes for Pedestrians with Vision Disabilities
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TRB's National Cooperative Highway Research Program (NCHRP) Report 674: Crossing Solutions at Roundabouts and Channelized Turn Lanes for Pedestrians with Vision Disabilities explores information related to establishing safe crossings at roundabouts and channelized turn lanes for pedestrians with vision disabilities.

Appendices B through N to NCHRP Report 674 were published as NCHRP Web-Only Document 160. The Appendices included in NCHRP Web-Only Document 160 are as follows:

• 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

On August 17, 2011, TRB co-sponsored a web briefing or "webinar" that presented information about the report. View the webinar page for more information and a link to the recorded webinar.


  • Transportation — Highways
  • Transportation — Pedestrians and Bicyclists
  • Transportation — Design
  • Transportation — Operations and Traffic Management
  • Transportation — Safety and Human Factors
  • Transportation — Society

Publication Info

152 pages | 8.5 x 11

Table of Contents

skim chapter
Front Matter i-xi
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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