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| Notation | Description |
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| Signal control and traffic demand variables |
| Effective green time for a phase (seconds) |
| Effective red time for a phase |
| Cycle length (seconds) |
| Green time to cycle time ratio ( |
| Traffic arrival rate (PCE per hour) |
| Saturation flow rate (vehicles per hour or PCE per hour) |
| Capacity (vehicles per hour or PCE per hour), |
| Volume-to-capacity ratio, /c |
|
| Conventional theoretical delay model variables |
| Total average control delay (seconds per vehicle or seconds per PCE) |
| Uniform delay (seconds per vehicle or seconds per PCE) |
| Random delay (seconds per vehicle or seconds per PCE) |
| Progression factor |
| Traffic demand (vehicles/hour or PCE/hour) |
| Adjustment factor for type of controller |
| Upstream filtering/metering adjustment factor |
| Analysis period (hours) |
| Size of the initial queue at the start of the analysis period T (vehicles) |
| Delay parameter |
| Practical degree of saturation |
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| Variables related to PCE estimation |
| Observed number of cars in a cycle |
| Observed number of vehicles of class i |
| Passenger car equivalent corresponding to vehicle class i |
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| Queuing theory-related variables |
| Ratio of arrival rate to departure rate |
| Number of service channels/number of virtual lanes |
| Coefficient of variation of the arrival distribution |
| Coefficient of variation of the departure distribution |
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| Additional variables |
| Multiplicative adjustment factor for the theoretical delay equation |
| Intersection flow ratio |
| Demand split ratio |
| Standard deviation of average control delay (seconds per PCE) |
| Mean absolute error (seconds per PCE) |
| Mean absolute percentage error (%) |
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