Abstract
The purpose of the study was to assess the impact that a low emission zone (LEZ) would have on the road transport subsystem. Different scenarios were adopted regarding: the spatial extent of the zone itself; the stages of its implementation, and the vehicles on the network (by age, engine displacement, and fuel type). The study was based on a macroscopic traffic model of Łódź employed to analyse how any LEZ-related restrictions may affect the operation of the urban road transport system in the city. The conducted analyses showed that while the implementation of a low emission zone would positively affect the environment, it would have a negative impact on the performance of the urban transport system itself. The simulations for each spatial scenario of the LEZ revealed that it would increase the travel times and distances necessary within the city limits, and also decrease travel speeds.
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