Development and Evaluation of a Detection-control System for Rural Intersections PDF Download
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Author: James A. Bonneson
Publisher:
ISBN:
Category : Detectors
Languages : en
Pages : 94
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Author: James A. Bonneson
Publisher:
ISBN:
Category : Detectors
Languages : en
Pages : 94
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Author: Karl Zimmerman
Publisher:
ISBN:
Category : Electronic traffic controls
Languages : en
Pages : 52
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Book Description
Traffic engineers are often faced with operational and safety challenges at rural, high-speed signalized intersections. Vehicle-actuated control, combined with multiple advance detectors, is often used to improve operations and safety. However, this type of detection and control has not always resulted in a significant number of crashes. Crashes sometimes continue to occur at high-speed intersections, and delays to traffic movements can be unnecessarily long. An innovative detection-control system was developed for the Texas Department of Transportation to minimize both delay and crash frequency at rural intersections. This system was subsequently implemented at several intersections in Texas and its safety and operational benefits were evaluated. This report documents the findings and conclusions reached as a result of a three-year implementation project. The Detection-Control System was installed at each of eight intersections in Texas during the three-year period. Five of the intersections were suitable for a before-after study of safety and operational data. An evaluation of the before-after data indicated that the Detection-Control System was able to reduce delay by 14 percent, stop frequency by 9 percent, red-light violations by 58 percent, heavy-vehicle red-light violations by 80 percent, and severe crash frequency by 39 percent.
Author:
Publisher:
ISBN:
Category : Detectors
Languages : en
Pages : 102
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Author: Karl H. Zimmerman
Publisher:
ISBN:
Category : Roads
Languages : en
Pages :
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This Innovations Deserving Exploratory Analysis project improved and evaluated a detection-control system (D-CS) for enhanced traffic safety at high speed signalized intersections. A literature review was conducted to identify potential enhancements to the D-CS control algorithm required to create the "second generation" D-CS algorithm. The needed enhancements included dilemma zone protection based on vehicle size, real-time dilemma zone changes, coordination, and real-time measures of effectiveness reporting. After selecting the most feasible enhancements, the control algorithm was modified and tested in the laboratory. Based on laboratory test results and refinements, a "second generation" D-CS control algorithm was developed capable of providing dilemma zone protection specific to vehicle type using a modified system to prevent max out during "Stage 2" operation.
Author: Ahmed Essam Radwan
Publisher:
ISBN:
Category :
Languages : en
Pages : 180
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Author: PeiFeng Fu
Publisher:
ISBN:
Category : Electronic traffic controls
Languages : en
Pages : 179
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This report documents the results of a study on evaluating three major video imaging vehicle detection systems (VIVDS) currently deployed in Nevada's urban areas. The report first provides a brief review of the features and functions of some major VIVDSs. The evaluation was based on videos collected at selected intersections in both Northern Nevada and Southern Nevada. The dataset included a total of 10 intersections consisting of 30 intersection approaches and about 48 hours of video for each approach. These videos were directly recorded with detection overlays from the VIVDSs at the sites. The detection accuracy was later verified manually by watching video playbacks in the lab. The performance of the VIVDS was assessed based on the accuracy level, taking into account the total missed and false detections. Missed and false detections were the two major sources of error considered in this study. Specific detection errors and possible causes were discussed for each site. Recommendations were provided for potentially reducing video detection errors. A set of guidelines were also provided for improving VIVDS' performance at existing intersections or future deployments.
Author: Dan R. Middleton
Publisher:
ISBN:
Category : Traffic flow
Languages : en
Pages : 118
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Author: University of Minnesota. Intelligent Transportation Systems Institute
Publisher:
ISBN:
Category : Intelligent Vehicle Highway Systems
Languages : en
Pages : 64
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Author:
Publisher:
ISBN:
Category : Electronic traffic controls
Languages : en
Pages : 184
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Book Description
The study was undertaken to improve understanding of how to place vehicle detectors at high-speed (at least 35 mph), isolated, traffic-actuated intersections, and how to test and evaluate alternative detector/controller configurations for intersection traffic safety and efficiency.
Author:
Publisher:
ISBN:
Category : Highway research
Languages : en
Pages : 104
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Book Description
