Paper presents assumptions to build simulation model allowing computational experimentation and inference on
impact of various factors on transport modal split and the impact that transport has on environment. It presents
a general mathematical model of environmentally friendly transport system and characterizes particular elements of
this model. The structure of transport network is mapped with a graph. The characteristics describing elements of this
structure, vehicles, and characteristics of harmful compounds emission are given. Model will be implemented in PTV
VISUM environment – a tool supporting planning of transport processes as well as analysis and designing of
transport systems. The model of proecological transport system developed in PTV VISUM will consist of model
of demand for both passenger and freight transport, and model of transport network cooperating with various means
of transport. Road and rail vehicles for passenger and freight transport are characterized and divided into groups
according to type of fuel and harmful emission. The demand for transport services and emission of exhaust gases
components are reflected in model of proecological transport system of Poland. The last part of paper presents
a sample of preliminary research on estimating emission from particular type of vehicle.
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