Permanent Signs Mounted on Median Barriers (2014) / Chapter Skim
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CONTENTS 1 SUMMARY 3 CHAPTER ONE INTRODUCTION Background, 3 Scope, 6 Study Approach, 6 8 CHAPTER TWO SIGN AND BARRIER DESIGN CRITERIA AND GUIDELINES Sign Usage and Placement, 8 Types of Rigid Median Barriers and the Zone of Intrusion, 9 Techniques for Reducing Zone of Intrusion Exposure, 11 12 CHAPTER THREE EXISTING SIGN AND BARRIER COMBINATIONS Rigid Barrier Types and Usage, 12 Overhead Sign Supports, 12 Small Barrier-Mounted Sign Supports, 15 22 CHAPTER FOUR TESTING AND RESEARCH Early Research, 22 More Recent Research, 22 25 CHAPTER FIVE CONCLUSIONS AND RESEARCH NEEDS Conclusions, 25 Research Needs, 26 28 REFERENCES 29 APPENDIX A NCHRP SYNTHESIS TOPIC 44-14 SURVEY QUESTIONNAIRE Note: Many of the photographs, figures, and tables in this report have been converted from color to grayscale for printing. The electronic version of the report (posted on the web at www.trb.org)
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SUMMARY PERMANENT SIGNS MOUNTED ON MEDIAN BARRIERS The synthesis study was conducted to identify and report on the current state of practice for mounting permanent highway signs on top of rigid median barriers throughout the United States. Information related to design standards, guidelines, individual agency practices, and research was gathered and evaluated to assess the extent to which barrier-mounted signs are used and the level of consideration some practices give to potential safety concerns.
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2 binations need to be evaluated to ensure that sign functionality and driver expectancy are not compromised. Results of these research efforts can help transportation agencies evaluate their current practices and provide a basis for making improvements.
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3 information to assist with regulatory compliance, warnings of potential hazards, and navigation guidance. Regardless of the messages they convey, the physical configuration of signs can be separated into two basic categories: (1)
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4 FIGURE 1 Typical overhead sign support configurations.
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5 side, as they travel on the right side of the road. However, in some circumstances it is necessary to place signs on the left-hand side.
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6 and snow removal. Additionally, barrier-mounted supports may be less likely than ground-mounted roadside signs to be struck and damaged by errant vehicles, which reduces repair costs, particularly for nuisance hits.
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7 • Literature review of state DOT standard plans and specifications to identify current practices in use throughout the United States. • Literature review of national design policies, specifications, and guidelines to assess their adequacy.
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