An isolated three-phase traffic signal is designed by Webster s method. The critical flow ratios for three phases are 0.20, 0.30 and 0.25 respectively, and lost time per phase is 4 seconds. The optimum cycle length (in seconds) is _________.

An isolated three-phase traffic signal is designed by Webster s method

1.	An isolated three-phase traffic signal is designed by Webster s method. The critical flow ratios for three phases are 0.20, 0.30 and 0.25 respectively, and lost time per phase is 4 seconds. The optimum cycle length (in seconds) is _________.
A.	90 to 95
B.	80 to 85
C.	40 to 60
D.	80 to 90
Answer» B. 80 to 85

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An isolated three-phase traffic signal is designed by Webster s method. The critical flow ratios for three phases are 0.20, 0.30 and 0.25 respectively, and lost time per phase is 4 seconds. The optimum cycle length (in seconds) is _________.

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