The paper presents fundamental issues related to traffic flow modeling using micro and macroscopic models. Both types of models are distinguished by the way vehicles are represented in the flow and how their movement is described. Microscopic models require modeling the dynamics of individual vehicle movement and the interactions occurring between neighboring vehicles. In contrast, in macroscopic models, vehicles are treated as a stream whose changes are described by flow rate, density, and speed.The presented modeling results concern a communication system where vehicle traffic is controlled by traffic lights. For the considered road scenario, spatial distributions of traffic flow speed and density were analyzed. After incorporating emission rate data for selected vehicle categories, an emission balance was performed.
A COMPARISON OF MICRO AND MACROSCOPIC TRAFFIC FLOW SIMULATIONS
In the paper a fundamental issues of traffic flow modeling are presented.
The micro and macroscopic models were chosen for traffic modelling. The method of regarding vehicles in stream distinguishes these models. The microscopic models require modelling of motion of individual vehicles as well as interaction between neighboring vehicles. However in macroscopic models vehicles are treated as the stream which motion are described by intensity, density and mean speed.
The spatial changes of density and vehicles speed obtained using both models were analyzed. Results of computer simulations concern road network in which traffic flow is controlled by traffic light. The model of instantaneous emission has been used to estimate exhaust emission for a different car categories. (…)
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Source: Logistyka Magazine