Infrastructural changes in the transport system of the city complicate the characteristics of travel time, traffic safety, air and noise pollution, living comfort, etc. The main causes could be formulated as follows -the actual infrastructure type and the street use are not compatible with a set of street functions, i.e. there are failures in the relations of function-form-use. The origin of this inadequacy is an old and wrongly developed street network, and improper combinations of street functions. The influence of infrastructural modifications on the characteristics of traffic flow were integrated. The model created describes the typical categories of streets, adequate complex functions and their relations. The conclusions show the possibility to apply this model to the evaluation of sustainability of changes in the urban street network.
The growing demand for transport and communication services leads to more and more important, traffic related and closely associated problems, especially in the city centre, such as traffic congestion, air pollution, noise and some others. When modelling traffic flows in the Kaunas city centre, the simulation models of crossroads were created based on the principle of cellular automaton model, taking into consideration such relevant traffic indicators as the average speed of traffic flow in diflerent streets, traffic intensity, congestions and distributed flows. Operation of cellular automaton model is associated with the improved approach of further vehicle model. Modelling of microscopic traffic flows is based on the brake light-cellular automaton (BL-CA) model. Random functions were made discreet and autocorrelation values of these functions were calculated in this work. Fundamental macroscopic traffic characteristics were obtained. Numerical dependences of the average traffic speed and traffic flow, traffic density and traffic flow, the average traffic speed and density were determined, with a help of which the demand parameters of transport network were evaluated in the Kaunas city centre in certain time intervals.
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