// multi-utility computation suite · offline · instant · precise
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eng.traffic-signal-timing Calculator
Calculates pedestrian walk and clearance timing, cycle length, and level of service for a signalised intersection. Pedestrian clearance time = crossing distance / walking speed (1.0 m/s) must be accommodated within the green phase — insufficient clearance time is a safety deficiency.
Inputs
Cycle Length S
Linear measurement. Ensure consistent units: 1 m = 1,000 mm = 3.281 ft.
Lost Time Per Phase S
Duration of the process. Make sure units match the rate inputs (seconds, minutes, or hours).
Num Phases
Count of items or occurrences.
Critical Flow Ratio Sum
Reference formula or conversion factor shown for context.
Results
effective green time (s)
The computed duration or time value.
green ratio
The proportional relationship between two quantities.
Webster optimal cycle (s)
Reference formula or conversion factor shown for context.
total lost time (s)
The combined total across all inputs and components.
Webster: Co = (1.5L+5)/(1-Y)
Reference formula or conversion factor shown for context.