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eng.traffic-signal-cycle-Webster Calculator
Calculates traffic signal cycle length, green splits, and delay using Webster's optimisation from turning movement counts. Signal timing that balances flow ratios across competing phases minimises intersection delay — under-timing creates queue overflow; over-timing wastes green time.
Inputs
L Lost Time S
Duration of the process. Make sure units match the rate inputs (seconds, minutes, or hours).
Y Flow Ratio
Reference formula or conversion factor shown for context.
Phf
A multiplier applied in the calculation.
N Phases
Count of items or occurrences.
Results
optimal cycle length Co (s)
The computed linear length.
green time per phase (s)
The current phase of the cycle or process.
Webster formula: Co = (1.5L+5)/(1-ΣY)
The specific form or variant of the result.
ΣY = Σ(flow/saturation flow)
How close the system is to its capacity limit. Above 80% sustained saturation typically leads to queuing and latency spikes.
saturation flow typical
How close the system is to its capacity limit. Above 80% sustained saturation typically leads to queuing and latency spikes.
minimum cycle
The smallest value in the dataset or feasible range.