GATE CE 2021 Set 2 — Question 34
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Transportation Engineering → Intersections & Signals → Signal Design (Webster's)
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Question
In a three-phase signal system design for a four-leg intersection, the critical flow ratios for each phase are , , and . The total loss time in each of the phases is s. As per Webster’s formula, the optimal cycle length (in s, round off to the nearest integer) is ___________
Correct answer
48 to 52
Solution
Given:
Number of phases,
Critical flow ratios: , ,
Sum of critical flow ratios,
Loss time per phase, s
Total loss time, sAccording to Webster's formula for optimal cycle length ():
sThe optimal cycle length is s.
Number of phases,
Critical flow ratios: , ,
Sum of critical flow ratios,
Loss time per phase, s
Total loss time, sAccording to Webster's formula for optimal cycle length ():
sThe optimal cycle length is s.
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