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Current guidance on impact conditions and clear zone requirements for vehicle encroachments in work zones is adequate. However, researchers may want to consider developing additional guidance for barrier type use in work zones and on the amount of lateral clearance that should be provided with use of traffic control devices placed on the left or right shoulder.

NCHRP Research Report 1055: Addressing Encroachment-Related Safety Issues in Work Zones: A Guide, from TRB's National Cooperative Highway Research Program, provides an analysis of data from several sources, including state crash databases and the National Highway Traffic Safety Administration's National Motor Vehicle Crash Causation Survey.

Supplemental to the report are NCHRP Web-Only Document 361: Determination of Work Zone Encroachments and a presentation describing the research.

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Suggested Citation

National Research Council. 2023. Addressing Encroachment-Related Safety Issues in Work Zones: A Guide. Washington, DC: The National Academies Press. https://doi.org/10.17226/27095.

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Publication Info

40 pages |  8.5 x 11 |  DOI: https://doi.org/10.17226/27095
Chapters skim
Front Matter i-viii
Chapter 1 - Introduction 1-2
Chapter 2 - Encroachment Data: Needs and Collection Methods 3-7
Chapter 3 - Encroachment Conditions and Driver Behavior in WZs 8-14
Chapter 4 - Identified and Proposed Guide Revisions 15-23
Chapter 5 - Considerations and Limitations 24-24
Chapter 6 - Conclusions 25-26
References 27-28
List of Abbreviations 29-34

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