Choice of the control variables of an isolated intersection by graph colouring

This paper deals with the problem of grouping traffic streams into signal groups on a signalized intersection. Determination of the complete sets of signal groups, i.e. the groups of traffic streams on one intersection, controlled by one control variable is defined in this paper as a graph-coloring problem. The complete sets of signal groups are obtained by coloring the complement of the graph of identical indications.
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Choice of the control variables of an isolated intersection by graph colouring