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Accession Number PB2014-106429
Title Design and Evaluation of a Dynamic Dilemma Zone System for a High Speed Rural Intersection.
Publication Date Aug 2012
Media Count 65p
Personal Author G. L. Chang M. Franz Y. Lu
Abstract The goal of this research was to develop a system that utilizes the dynamic detection technology and to evaluate the performance of this system. The first step of this study was to select an intersection experiencing a high frequency of crashes that could be remedied by a dilemma-zone protection system. Next, a dynamic dilemma-zone protection system was designed using three microwave sensors to track vehicles approaching the intersection on the major approach. The data collected by these sensors were then used in real-time to control the signal logic, providing green extensions and all-red extensions when pre-defined parameters of detected vehicles are met. To evaluate the performance of the system design and the appropriateness of the associated parameters, a field test was conducted. The data analysis included the identification of false called all-red extensions (related to efficiency) and missed all-red extensions (related to safety) to assess the overall performance of the newly installed dynamic dilemma zone protection system.
Keywords Acceleration
Collision research
Crash rates
Design guidance reviews
Divided highways
High speed highways
Highway design
Highway planning
Literature reviews
Rural expressway intersections
Rural roads
Safety treatments

Source Agency Maryland Department of Transportation Division of Finance
NTIS Subject Category 85D - Transportation Safety
85H - Road Transportation
91B - Transportation & Traffic Planning
43G - Transportation
50A - Highway Engineering
50B - Civil Engineering
Corporate Author Maryland Univ., College Park.
Document Type Technical report
Title Note Final rept.
NTIS Issue Number 1418
Contract Number SP708B4J

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