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Browsing by Author "Bae, Sanghoon"

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    Development of a real-time and geographical information system-based transit management information system
    Bae, Sanghoon (Virginia Tech, 1993-06-17)
    The Tidewater Regional Transit (TRT) in Virginia has implemented an Automatic Vehicle Location (AVL) system into their bus system. However, there are some problems with the system that TRT is endeavoring to resolve in order to maximize its utilization. Therefore, the main goal of this research was to develop an automated Management Information System (MIS) that processes the overwhelming real-time incoming data from the AVL system in TRT, and to present it promptly in an easy-to-access, easy-to-understand, and easy-to-use format. In order to meet this goal, development of a graphics- and Geographical Information System (GIS)-based display system is essential. Classification of data from the AVL system according to its priority, relevancy, and demand level was the first step in achieving the goal of this research. The second step was to develop a user-friendly, menu-option display system. This step mainly focuses on the structured computer model construction so that its future potential for expansion and modification is easily accommodated. The last step of the research was to develop a GIS-based display system. For this task, the TIGER/Line Census file is utilized as the data file for map display. Since the topic of this research - MIS development - is a part of a proposed Advanced Public Transportation System (APTS) research project, its future research direction is also identified. One of the most important recommendations for the future research is the real-time operational application of the developed MIS model.
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    Dynamic estimation of travel time on arterial roads by using automatic vehicle location (AVL) bus as a vehicle probe
    Bae, Sanghoon (Virginia Tech, 1995-05-11)
    A method of reducing congestion is to reduce the demand by providing the road network users with accurate and reliable travel time information for their pretrip planning and enroute guidance, and/or attracting more people to the public transit. For this purpose, this research concenturates on using Automatic Vehicle Location (AVL) system equipped bus as a probe vehicle for estimating bus arrival times and auto travel times. Since many transit organizations throughout the North America are currently operating these AVL buses on their bus routes, in a sense, existing AVL bus would be the most cost-effective traffic probe which can be utilized for data collection in the proactive mode. Therefore, the goals of this research are to enhance the current use of AVL systems by introducing a new module to estimate bus arrival time information for transit travelers, and use AVL systems-equipped bus as a probe vehicle to estimate the nontransit travel time for auto travelers.