Predicting future behaviors of vehicles is addressed in some traffic monitoring systems. However there has not been the kind of emphasis on interactions between behaviors of multiple vehicles. We focus on the interactions and introduce a concept of Attainable Region in order to predict future behaviors of vehicles. Attainable Region is defined as a region where a vehicle can attain in a few seconds. The regions are calculated by combining prior knowledge about traffic scenes with observed information. Interactions between vehicles' behaviors can be estimated by checking overlaps between the regions. Through evaluation experiments, we show the feasibility of prediction with Attainable Region.
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