VISSIM 5.30-05 User Manual

11.22 Convergence Evaluation
Convergence Evaluation
The Convergence Evaluation file (CVA) can be used with the Dynamic
Assignment module only. For every time interval it contains the distribution of
changes in volume and travel times of all edges and paths. Therefore volume
changes are divided into 9 volume classes and travel time changes into 12
travel time classes. For every class the number of paths/edges are shown
that have changed in terms of volume and travel time. This data can be used
to determine whether or not the Dynamic Assignment process has
converged. For more information please refer to chapter 12.
If a sequence of simulation runs is executed in batch mode (command line
parameter -s) the simulation run number (1..n) will be included in the
*.CVA file name.
Definition
No additional definition required.
Configuration
This is to be provided within the Convergence Configuration window which is
accessed by pressing the CONFIGURATION button in EVALUATION – FILES… -
[VEHICLES], once the option Convergence is active.
Here the minimum edge
length can be defined for
edges to be considered for
the calculation of travel time
differences.
Shorter edges will not be included in convergence detection and evaluation.
Results
The results from the Convergence Evaluation are displayed in a text table
that compares the volumes and travel times on all of the edges and paths
(longer than defined in the configuration) for each iteration.
A convergence evaluation file (*.CVA) contains the following information:
► File title
► Path and name of the input file (File)
► Simulation comment (Comment)
► Date and time of the evaluation (Date)
► Version no. with Service pack no. and Build no. (VISSIM)
► Data table:
The table is divided into two blocks:
- Volume difference
- Travel time difference
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