期刊
TRANSPORTATION RESEARCH PART C-EMERGING TECHNOLOGIES
卷 15, 期 6, 页码 380-391出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.trc.2007.06.003
关键词
travel time measurement; probe vehicles; cellular phones
The purpose of this paper is to examine the performance of a new operational system for measuring traffic speeds and travel times which is based on information from a cellular phone service provider. Cellular measurements are compared with those obtained by dual magnetic loop detectors. The comparison uses data for a busy 14 km freeway with 10 interchanges, in both directions, during January-March of 2005. The dataset contains 1284 587 valid loop detector speed measurements and 440331 valid measurements from the cellular system, each measurement referring to a 5 min interval. During one week in this period, 25 floating car measurements were conducted as additional comparison observations. The analyses include visual, graphical, and statistical techniques; focusing in particular on comparisons of speed patterns in the time-space domain. The main finding is that there is a good match between the two measurement methods, indicating that the cellular phone-based system can be useful for various practical applications such as advanced traveler information systems and evaluating system performance for modeling and planning. (c) 2007 Elsevier Ltd. All rights reserved.
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