Abstract: The article presents a mechanism for creating traffic control algorithms in a selected urban area using computer-aided support. The specification of these algorithms utilizes finite state machine transition graphs, including hierarchical graphs. The developed adaptive area control algorithms were specified in an FSM editor, which allows for the verification of algorithm correctness in a functional computer simulation mode. The results of the specification and verification of the developed algorithms, as well as their implementation in programmable logic structures (FPGA), are presented.1. INTRODUCTION
The development of motorization observed in the 1970s, the extraordinary and unforeseen intensity of which became apparent in the 1980s and 1990s, and its consequences, particularly noticeable in urban areas, became an obvious impetus for seeking new, more complex methods of traffic control. A cyclic traffic light program at a selected intersection, even if prepared most meticulously, proved to be an insufficient solution in situations where many controlled intersections are in close proximity.
The increasing number of signalized intersections created a need to interdepend (coordinate) the signaling of neighboring intersections.
Also, in new solutions for local controllers and traffic control systems, it became necessary to consider issues of area control.
Previous research results devoted to the implementation of local controllers in programmable logic structures [1,2] allow us to conclude that it is reasonable to consider the application of such solutions at the area control level.
The low utilization of FPGA structure resources by local controllers at a single intersection creates an opportunity to use specialized controllers implemented in FPGAs for street area control. It is expected that appropriate area control algorithms, being a combination of adaptive control with a certain type of network optimization based on the criterion of time losses and queue lengths, will allow for the improvement of traffic conditions in the controlled urban area. (…)
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Source: Logistyka Magazine