Abstract: In this paper we present an approach to embedding scenarios in ambient traffic through the use of on-line casting, wherein vehicles are dynamically assigned scenario roles during simulation. We present a model of a scene as an abstraction that encapsulates the actions of principal role players, the background activity, and the setting in which it is to take place. We explain how we stage scenes using traffic managers that dynamically place and remove vehicles, and directors that assign roles and coordinate the action. We demonstrate the approach with scenes involving crash threats at intersections.

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