Examples
Examples
Try the starting example
- Critical flow ratios by phase
- 0.2,0.25,0.15
- Total lost time per cycle (seconds)
- 12
- Illustrative Webster cycle (seconds)
- 57.5
- Effective green allocations (seconds) JSON
- [15.1666666667,18.9583333333,11.375]
Try another scenario
- Critical flow ratios by phase
- [0.22000000000000003, 0.25, 0.15]
- Total lost time per cycle (seconds)
- 12
- Illustrative Webster cycle (seconds)
- 60.526316
- Effective green allocations (seconds) JSON
- [17.2190152801,19.5670628183,11.740237691]
Calculation method
Calculation method
Illustrative Webster cycle (seconds)
Webster illustrative C=(1.5L+5)/(1−Σcritical ratios); split effective green C−L in proportion to critical ratios.
Effective green allocations (seconds) JSON
Webster illustrative C=(1.5L+5)/(1−Σcritical ratios); split effective green C−L in proportion to critical ratios.
Symbols and units
- a
- Critical flow ratios by phase
- b
- Total lost time per cycle (seconds)
Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.
Assumptions & limits
Assumptions & limits
- Illustrative undersaturated fixed-time calculation; omits minimum pedestrian timings, coordination, saturation changes and implementation safety requirements. Supported limits: Finite numeric values bounded to 1e9 magnitude; lists and tables contain 1–100 records unless a stricter bound is stated. Inputs use the units shown. Lists explicitly paired by a method must have matching lengths; independent polynomial coefficient vectors may differ. Respect stated physical, interpolation, policy and computational domain limits.
Are these inputs private?
These calculations run in your browser. A shared link contains the values you choose to share. Only questions submitted to the separate AI finder are sent to OpenAI.
Further reading
Background reading; this does not imply endorsement or independent review of SumFizz.