Traffic Modeling and Simulation 

Bedgsbron i Norrköping, kvällstid, lång bilkö

Traffic models are mathematical descriptions of the transportation infrastructure and the people using the transportation system. The models can be presented as optimization models, which are common for normative models, or as simulation models, which are common for descriptive models.

The traffic model includes descriptions of the different types of infrastructure in the transport system, for example, highways, arterials, roundabouts, streets, as well as the vehicles in the system, cars, busses, lorries and bikes, and also the users of the system, either inside the vehicles or as pedestrians. Traffic models are used for experimental studies of a number of different phenomena in the transport system. 

Simulation, as a tool, is be used when studying models which are too complicated for analytical or direct numerical analysis. The simulation tool can often also provide possibilities to generate visual demonstrations of both the present scenario and for different future scenarios. The output from the models can either be used as a direct result in a traffic engineering problem, for example when new infrastructure shall be evaluated a priori, or as input to social economical models, or as input to energy use and emission estimation models.

Our research includes both the development of new types of models, and the application of models to new situations. The models studied include both the demand and supply side of the problem and, for example, simulation models for three land roads (2+1), and a simulation model of pedestrians have been developed.

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