Collecting ambient vehicle trajectories from an instrumented probe vehicle: High quality data for microscopic traffic flow studies |
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Institution: | 1. The Ohio State University, Joint Appointment with the Department of Civil, Environmental, and Geodetic Engineering, and the Department of Electrical and Computer Engineering, Hitchcock Hall 470, 2070 Neil Ave, Columbus, OH 43210, United States;2. The Ohio State University, Department of Electrical and Computer Engineering, United States;3. Battelle Memorial Institute, United States;1. School of Transportation Science and Engineering, Beijing Key Laboratory for Cooperative Infrastructure System and Safety Control, Beihang University, Beijing 100191, China;2. School of Traffic and Transportation, Beijing Jiaotong University, Beijing 100044, China;1. TUM CREATE, Singapore;2. Nanyang Technological University, Singapore;3. Technische Universität München, Germany;1. Department of Civil and Environmental Engineering, University of Massachusetts, Lowell, United States;2. Department of Civil and Environmental Engineering, University of Wisconsin, Madison, United States |
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Abstract: | This paper presents the methodology and results from a study to extract empirical microscopic vehicular interactions from a probe vehicle instrumented with sensors to monitor the ambient vehicles as it traverses a 28 mi long freeway corridor. The contributions of this paper are two fold: first, the general method and approach to seek a cost-effective balance between automation and manual data reduction that transcends the specific application. Second, the resulting empirical data set is intended to help advance traffic flow theory in general and car following models in particular. Generally the collection of empirical microscopic vehicle interaction data is either too computationally intensive or labor intensive. Historically automatic data extraction does not provide the precision necessary to advance traffic flow theory, while the labor demands of manual data extraction have limited past efforts to small scales. Key to the present study is striking the right balance between automatic and manual processing. Recognizing that any empirical microscopic data for traffic flow theory has to be manually validated anyway, the present study uses a “pretty good” automated processing algorithm followed by detailed manual cleanup using an efficient user interface to rapidly process the data. The study spans roughly two hours of data collected on a freeway during the afternoon peak of a typical weekday that includes recurring congestion. The corresponding data are being made available to the research community to help advance traffic flow theory in general and car following models in particular. |
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Keywords: | Highway traffic Empirical data Microscopic data set Traffic flow theory Car following Lane change maneuvers Congested traffic LIDAR |
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