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The paper is dealing with a fuzzy control approach to urban road traffic lights. Starting with a brief review on some of the publications on this topic, the problem of controlling an intersection with 12 main direction traffic flows is tackled. Depending on traffic situations the fuzzy rule set decides on the activation of a two-state, three-state or four-state control. In this way the merits of each of these control schemes are combined. The state machine used, linguistic variables and essential ideas of fuzzy rule design are explained.>
Hoyer et al. (Sat,) studied this question.