TRB's National Cooperative Highway Research Program (NCHRP) Web-Only Document 222: Guidelines for the Application of Crossing Solutions at Roundabouts and Channelized Turn Lanes for Pedestrians with Vision Disabilities provides guidance to engineers and planners on the design of roundabouts and channelized turn lanes for accessibility. NCHRP Web-Only Document 222 is the final report for NCHRP Research Report 834: Crossing Solutions at Roundabouts and Channelized Turn Lanes for Pedestrians with Vision Disabilities: A Guidebook.
The accessibility of modern roundabouts and intersections with channelized turn lanes is an important civil rights challenge in the United States that has broad potential implications for engineering practice in this country. This report builds on the results of NCHRP Report 674: Crossing Solutions at Roundabouts and Channelized Turn Lanes for Pedestrians with Vision Disabilities. It provides a framework for empirical study and analysis of accessibility performance, documents field testing of several treatments, and provides a research extension through modeling and simulation to expand the results beyond the field-tested sites.
Table of Contents
|2 Literature Review||5-18|
|4 Field Study Results||41-70|
|5 Modeling and Applications||71-94|
|7 Appendix A: Wayfinding Data Details||103-116|
|8 Appendix B: Yield Model Details||117-124|
|9 Appendix C: Risk Model Details||125-136|
|11 Appendix D: Crossing Sight Distance Details||137-158|
|12 APPENDIX E: SITE PHOTO LOGS||159-276|
|13 Appendix F: Detailed Field Study Results||277-339|
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