Headway-based assignment: Impedance tab
In this tab you configure the parameters for the distribution of the demand to the found paths. Decide whether the calculation shall be based on perceived journey time and fare points or on perceived journey time and fare (Fundamentals: Generalized costs as impedance).
Element |
Description |
Impedance |
The impedance of a path results from the total calculated either from perceived journey time (PCJ) and number of fare points or from perceived journey time and fare. You may enter a weighting factor for each of the addends. Below you define how the PJT is to be calculated. The number of fare points is calculated based on the input data of the corresponding network objects (Inserting fare points at network objects). The fare is based on the PuT fares defined (Defining PuT fares). Note If the impedance calculation accounts for the fare, Visum will automatically select the option Each path leg separately for the fare system's 'Fare applies to' option (Defining fare systems). |
Perceived journey time PJT |
The perceived journey time is the sum of different times and supplements (Fundamentals: Generalized costs as impedance). PJT = Factor • In-vehicle time • (in)direct numerical time profile item attribute + Factor • PuT-Aux ride time + Factor • Access time + Factor • Egress time + Factor • Walk time + Factor • Origin wait time, where the OWT is calculated according to a formula + Factor • Transfer wait time • direct and indirect numerical stop area attribute + Factor • Number of transfers + Boarding penalty PuT (numerical time profile item attribute) + Boarding penalty PuT-Aux (numerical transport system attribute) + Mean delay (numerical time profile item attribute) Notes
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