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Traffic Information Deriving Using GPS Probe Vehicle Data Integrated with GIS

With the rapid vehicle volume growth on roads, the performance of urban road traffic systems is a major concern to transportation planners, road users, and all members of the urban community. The evaluation of the performance measures relies on the accuracy and reliability of the collected traffic data. This paper describes a method of extracting transportation information using global positioning system (GPS) receivers integrated with geographic information system (GIS) technology. An AgGPS132 DGPS receiver was used to collect probe vehicle data along several highways of interest in Columbus, Ohio for 2002 and 2003. A digital orthophoto quarter-quadrangle (DOQQ 2000) with a ground resolution of 0.5 ft (0.15 m) is used as a backdrop to develop the highway database. The collected GPS points were mapped to the highway using a "snapping" technique in a GIS environment. Travel time, speed and congestion index values were measured along selected highway segments for evaluating the traffic condition of the highways. The results of GPS data compared favorably with the corresponding loop detector data. For all runs, the average difference values between the GPS probe vehicle speed data and the loop detector speed data were less than 4 mph (6.4 km/hr).