// multi-utility computation suite · offline · instant · precise
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eng.traffic-signal-Webster-cycle Calculator
Calculates the optimum cycle length for a traffic signal using Webster's formula from lost time per phase and degree of saturation. Webster's formula C_opt = (1.5L + 5) / (1 − Y) where Y is total flow ratio — it minimises total vehicle delay at the intersection.
Inputs
L S
Duration of the process. Make sure units match the rate inputs (seconds, minutes, or hours).
Y Sum
Reference formula or conversion factor shown for context.
Phf
A multiplier applied in the calculation.
Results
optimal cycle length Co (s)
The computed linear length.
practical cycle length (5s rounded)
The computed linear length.
total effective green time (s)
The combined total across all inputs and components.
Co = (1.5L + 5) / (1 − ΣY)
Reference formula or conversion factor shown for context.
ΣY interpretation
Qualitative summary of what the computed numbers mean in practical terms.
HCM range
The difference between the maximum and minimum values.