Journal
TRANSPORTATION RESEARCH PART C-EMERGING TECHNOLOGIES
Volume 8, Issue 1-6, Pages 257-285Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0968-090X(00)00015-2
Keywords
moving observer traffic studies; traffic congestion; Global Positioning System; Geographic Information System; traffic data analysis
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The Transport Systems Centre (TSC) has developed an integrated Global Positioning System (GPS)Geographical information System (GIS) for collecting on-road traffic data from a probe vehicle. This system has been further integrated with the engine management system of a vehicle to provide time-tagged data on GPS position and speed, distance travelled, acceleration, fuel consumption, engine performance. and air pollutant emissions on a second-by-second basis. These data are handled within a GIS and can be processed and queried during the data collection (from a notebook PC in the vehicle) or saved to a file for later analysis. The database so generated provides a rich source of information for studies of travel times and delays, congestion levels, and energy and emissions. A case study application of the system is described focusing on studies of congestion levels on two parallel routes in a major arterial corridor in metropolitan Adelaide, South Australia. As part of these investigations, a discussion of the nature of traffic congestion is given. This provides both a general definition of traffic congestion and the discussion of a number of parametric measures of congestion. The computation of these parameters for the study corridor on the basis of data collected from the integrated GPS-GIS system is described. The GIS provides a database management platform for the integration, display, and analysis of the data collected from GPS and the in-vehicle instrumentation. (C) 2000 Elsevier Science Ltd. All rights reserved.
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