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Evaluation of Traffic Data Obtained via GPS-Enabled Mobile Phones: the Mobile Century Field Experiment

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  • Herrera, Juan C.
  • Work, Daniel B.
  • Herring, Ryan
  • Ban, Xuegang Jeff
  • Bayen, Alexandre M
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    Abstract

    The growing need of the driving public for accurate traffic information has spurred the deployment of large scale dedicated monitoring infrastructure systems, which mainly consist in the use of inductive loop detectors and video cameras. On-board electronic devices have been proposed as an alternative traffic sensing infrastructure, as they usually provide a cost-effective way to collect traffic data, leveraging existing communication infrastructure such as the cellular phone network. A traffic monitoring system based on GPS-enabled smartphones exploits the extensive coverage provided by the cellular network, the high accuracy in position and velocity measurements provided by GPS devices, and the existing infrastructure of the communication network. This article presents a field experiment nicknamed Mobile Century, which was conceived as a proof of concept of such a system. Mobile Century included 100 vehicles carrying a GPS-enabled Nokia N95 phone driving loops on a 10-mile stretch of I-880 near Union City, California, for 8 hours. Data were collected using virtual trip lines, which are geographical markers stored in the handset that probabilistically trigger position and speed updates when the handset crosses them. The proposed prototype system provided sufficient data for traffic monitoring purposes while managing the privacy of participants. The data obtained in the experiment were processed in real-time and successfully broadcast on the internet, demonstrating the feasibility of the proposed system for real-time traffic monitoring. Results suggest that a 2-3% penetration of cell phones in the driver population is enough to provide accurate measurements of the velocity of the traffic flow.

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    Bibliographic Info

    Paper provided by Institute of Transportation Studies, UC Berkeley in its series Institute of Transportation Studies, Research Reports, Working Papers, Proceedings with number qt0sd42014.

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    Date of creation: 01 Aug 2009
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    Handle: RePEc:cdl:itsrrp:qt0sd42014

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    1. Ygnace, Jean-Luc & Drane, Chris & Yim, Y. B. & de Lacvivier, Renaud, 2000. "Travel Time Estimation on the San Francisco Bay Area Network Using Cellular Phones as Probes," Institute of Transportation Studies, Research Reports, Working Papers, Proceedings, Institute of Transportation Studies, UC Berkeley qt8xn8m01v, Institute of Transportation Studies, UC Berkeley.
    2. John, Wright & Dahlgren, Joy, 2001. "Using Vehicles Equipped with Toll Tags as Probes for Providing Travel Times," Institute of Transportation Studies, Research Reports, Working Papers, Proceedings, Institute of Transportation Studies, UC Berkeley qt9f17h2j0, Institute of Transportation Studies, UC Berkeley.
    3. Moore, II, James E. & Cho, Seongkil & Basu, Arup & Mezger, Daniel B., 2001. "Use of Los Angeles Freeway Service Patrol Vehicles as Probe Vehicles," Institute of Transportation Studies, Research Reports, Working Papers, Proceedings, Institute of Transportation Studies, UC Berkeley qt8qf8430v, Institute of Transportation Studies, UC Berkeley.
    4. Westerman, Marcel & Litjens, Remco & Linnartz, Jean-paul, 1996. "Integration Of Probe Vehicle And Induction Loop Data: Estimation Of Travel Times And Automatic Incident Detection," Institute of Transportation Studies, Research Reports, Working Papers, Proceedings, Institute of Transportation Studies, UC Berkeley qt8mh629c3, Institute of Transportation Studies, UC Berkeley.
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