GATE 2022 CE (CE1) – Question 62
A two-phase signalized intersection is designed with a cycle time of 100 s. The amber and red times for each phase are 4 s and 50 s, respectively. If the total lost time per phase due to start-up and clearance is 2 s, the effective green time of each phase is ______s. (in integer)
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Correct answer: 48
Explanation
For each phase, displayed green is $100-50-4=46$ s. Effective green includes green plus amber, less start-up and clearance lost time.
Thus $g_e=46+4-2=\mathbf{48}$ s per phase. The two phases provide 96 s effective green, consistent with 4 s total lost time per cycle.