hierarchical system, dynamic system, traffic crossroads, expert system

Nowadays in the field of the automotive industry and urban public transport there are a lot of challenges and problems to solve. Every day there are closures, road work, and other aspects of public transport, which cause traffic jams. This article deals with a hierarchical system for optimizing the dynamic system of traffic crossroads control using the expert system. The hierarchical sys-tem uses expert system constructed in few layers which evaluate the length of green signal for each phase of crossroad. The main goal of proposed system is traffic optimization at crossroads and reduction of traffic jams. The proposed system was verified on a real crossroad in city Ostrava.