Civil Engineering MCQAE Level Civil Engineering
Webster optimum signal cycle length Co for an intersection with total flow ratio Y and total lost time L per cycle is:
Transportation EngineeringTraffic Signal CycleMEDIUM
Choose the correct answer
A
Co = (1.5L + 5) / (1 - Y)
B
Co = L / (1 - Y)
C
Co = 1.5L / Y
D
Co = L + 5 + Y
Correct Answer
A. Co = (1.5L + 5) / (1 - Y)
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Webster optimal cycle: Co = (1.5L + 5) / (1 - Y), where L = total lost time per cycle (sum of inter-green periods + start-up losses), Y = sum of critical flow ratios for each phase (Y = sum of q/s for each phase). Minimizes total delay.
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