NCHRP Report 524:

Safety of U-Turns at Unsignalized Median Openings

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Size: 142 pages, 8.5 x 11

Publication Year:2004

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Authors:
H S Levinson; D W Harwood; J S Gluck; P M Garvey; D J Torbic; K R Richard; I B Potts; R S Ghebrial; Transportation Research Board
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TRB's National Cooperative Highway Research Program (NCHRP) Report 524: Safety of U-Turns at Unsignalized Median Openings includes recommended guidelines for locating and designing unsignalized median openings, and a methodology for comparing the relative safety performance of different designs. ...
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Table of Contents
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Front Matter	i-viii
Summary	1-2	(skim)
Organization of This Report	3-4	(skim)
Location of Median Openings	5-5	(skim)
Spacing of Median Openings	6-6	(skim)
Safety of Median Openings	7-7	(skim)
Median Width	8-9	(skim)
Safety Effects of Median Treatments (Raised/Depressed/Flush/TWLTL)	10-14	(skim)
Safety Effects of Increasing U-Turn Maneuvers Through Use of Nontraversable Medians	15-15	(skim)
Left-Turn Lanes	16-17	(skim)
Median Acceleration Lanes	18-19	(skim)
Sight Distance at Median Openings	20-20	(skim)
Indirect Left-Turn Maneuvers	21-23	(skim)
Access Management	24-24	(skim)
Spacing Between Access Points	25-25	(skim)
Effects of Adjacent Traffic Signals	26-26	(skim)
Location and Design of Median Openings	27-27	(skim)
Treatment of U-Turns at Median Openings	28-30	(skim)
Median and Roadway Widths to Accommodate U-Turn Maneuvers	31-31	(skim)
Mitigation Measures for Safety Problems	32-32	(skim)
Factors Used in Classification of Median Opening Designs	33-33	(skim)
Overview of Typical Median Opening Designs	34-41	(skim)
Factors That Influence the Safety and Operational Performance of Median Openings	42-51	(skim)
Relative Safety of Median Opening Designs Based on Traffic Conflict Points	52-52	(skim)
Combinations of Median Openings Along Arterial Streets	53-58	(skim)
Catalog of Existing Median Openings	59-61	(skim)
Data Collection and Analysis for Selected Median Openings	62-67	(skim)
Median Opening Accident Frequencies	68-68	(skim)
Median Opening Accident Rates	69-70	(skim)
Median Opening Conflict Rates	71-71	(skim)
Comparison of Median Opening Accident and Conflict Rates	72-73	(skim)
Combinations of Median Openings	74-78	(skim)
Conclusions	79-79	(skim)
Recommendations,	80-80	(skim)
References	81-82	(skim)
Appendix A - Highway Agency Survey Questionnaire	83-89	(skim)
Appendix B - Summary of Survey Responses From State and Local Highway Agencies	90-105	(skim)
Appendix C - Guidelines for the Use, Location, and Design of Unsignalized Median Openings	106-133	(skim)
Abbreviations used without definitions in TRB publications	134-134	(skim)

Description

TRB's National Cooperative Highway Research Program (NCHRP) Report 524: Safety of U-Turns at Unsignalized Median Openings includes recommended guidelines for locating and designing unsignalized median openings, and a methodology for comparing the relative safety performance of different designs.

NCHRP Report 524:

Safety of U-Turns at Unsignalized Median Openings

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