United States Department of Transportation
i
Feasibility of Using Video Image Detectors for Ramp Signal Operations and Performance Monitoring
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2019-12-01
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[PDF-4.08 MB]
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Edition:Final Report
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Abstract:District 6 Florida Department of Transportation (FDOT) has been using both inductive loops and Sensys Networks sensors at its 22 ramp signals on I-95 in Miami-Dade County, Florida. These detectors are used to detect vehicle volumes and occupancy, but do not collect traffic measures such as queue length and waiting time, which are desired for performance monitoring of ramp signals. This project investigated the feasibility of using a video detection system for not only ramp signal operations but also performance monitoring. The project also developed a Web-based system for visualizing performance data to assist in the performance monitoring and analysis. A three-step study was conducted to attempt to identify a feasible video detection system: (1) identify and select three existing video detection systems for field evaluation at an actual ramp signal location; (2) conduct a field evaluation of the selected systems to determine their detection capabilities and accuracies; and (3) identify a final system based on the results from the field evaluation and other considerations including compatibility with the SunGuide software, and deployment and maintenance requirements and associated costs. Three video detection systems from FLIR, GRIDSMART, and ITERIS, respectively, were field tested. It was found that the system from FLIR produced the most positive results. The FLIR system was further evaluated for its ease of integration with the SunGuide software and its deployment and maintenance requirements and costs. A pilot test was subsequently conducted by FDOT (outside the scope of this project) to ensure that the FLIR system could be integrated with the SunGuide system and could replace the current ramp signal loop detectors for ramp signal operations. After the pilot test provided positive results, the project proceeded to develop a Web-based system for visualizing SunGuide detector data for the purpose of performance monitoring and analysis. The system is able to dynamically aggregate and display detector data on a chart. The system can also display the nearby traffic incidents that occurred within the selected time periods and days. As the detector data structures in the SunGuide database are standardized across all detectors throughout the state, the system is applicable to all detectors in all FDOT districts.
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