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An intersection has a four-phase signal with the movements allowed in each phase


 An intersection has a four-phase signal with the movements allowed in each phase and the corresponding analysis and saturation flow rates shown in the table below. Please complete the following:

 a. Calculate the sum of flow ratios for the critical lane groups. 

 b. Calculate the minimum cycle length and effective green time for each phase (balancing v/c ratio for each lane group). Assume the lost time is 4 sec/phase and a critical intersection vc ratio of 0.95 is desired.

 c. Calculate the optimal cycle length and corresponding effective green times (based on lane group vic equalization). Assume lost time is 4 seconds per phase

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