By Johan Janson Olstam.
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Additional info for A model for simulation and generation of surrounding vehicles in driving simulators
The interactions can be both observed and anticipated interactions. Then she estimates the duration of the interaction, meaning the time before the interaction will disappear. For example a slower vehicle in front will lead to an interaction but the duration of the interaction can be estimated as short if the obstacle vehicle has turned on its indicator in order to leave the road. In cases where the interaction duration is estimated as short the driver chooses to adapt to the situation and thereby stay in the current lane.
These speed-flow relationships vary with road type, vehicle type, speed limit, number of lanes, road width, and sight class. However, in the model not all dependent variables are used. The speed-flow relationship for cars is for instance used for all vehicle types and on rural roads the relationships for the best sight class (class 1) is used irrespective of the sight class of the simulated road. The relationships in the model depend on the road type, road width and the speed limit. 3 Examples of speed-flow relationships for a freeway with speed limit 90 km/h and a 8-10 m wide rural road with speed limit 90 km/h (SRA, 2001).
Alloyer et al. (1997) proposed a framework for dealing with on-line creation of scenes. Following the theatrical terminology used in Alloyer et al. , 1997). The set is a description of the physical surroundings at the place where the scene will take place. It also includes a specification of which actors that will be present in the scene. The casting is the procedure of choosing suitable traffic elements, vehicles, pedestrians, etc, for the different “roles”. The script is finally the specification of all actions that are going to take place in the scene.