## Fig xA Membership functions for

Fig. 8. Membership functions for the number of vehicles (input variables).Figure optionsDownload full-size imageDownload as PowerPoint slide

The membership functions for the output value (green time duration) are three (Min, Medium, Max). Considering that PF562271 in current practice the minimum green time should be no shorter than 15 s and no longer than 90 s, the membership functions can be represented as in Fig. 9.

Fig. 9. Membership functions for the green light duration (output variables). (For interpretation of the references to colour in bicarbonate ions figure legend, the reader is referred to the web version of this article.)Figure optionsDownload full-size imageDownload as PowerPoint slide

The second step of our approach is characterized by an inference mechanism through which the fuzzified information are correlated, following a linguistic approach based on the IF-THEN construct. Table 4 summarizes the rules that match the antecedents and consequents for the ith controller.