VISSIM 5.30-05 User Manual

12 Dynamic Assignment
● Archive files: If this option is active, existing output files *.BEW and
*.WEG which are stored in the same folder as the *.INP file will be
renamed. Numbers will be added to the filenames prior to creating new
output files.
Archiving of cost and path files saves the existing initial files, too. These
additional initial archive files (with number zero) are created for the path
and cost files if the following applies:
- option Archive files is checked and
- path and/or cost files exist (when starting the simulation) and
- there are not any existing archive files in the directory.
This is done for both a normal continuous simulation and for the first run
of a multirun series.
If there are already archive files in the directory then these initial archive
files are not created because it is assumed that the last archive files
correspond to the current start path/cost files.
Thus the data file archive allows for subsequent analyses of changes
during Dynamic Assignment. You even might start calculation from an
elder assignment state.
If this option is not active, existing output files *.BEW and *.WEG are
replaced.
● Store Costs: If checked, VISSIM writes a new cost file.
● EXTENDED: Access to
- the smoothing factor for cost calculation with regard to former edge
evaluations or
- MSA (Method of successive averages), cf. section 12.5.2.
● Search new paths: If checked VISSIM calculates new shortest paths
through the network.
● EXTENDED: Further options to limit the number of routes being found, cf.
section 12.8.4.
● Store paths (and volumes): If checked VISSIM stores new paths and
their volumes in the path file.
If VISSIM is run in batch mode with a specified number of runs VISSIM
creates or overwrites cost and path files automatically.
● The Kirchhoff Exponent: Sensitivity parameter of the Kirchhoff
distribution function used for route choice
● Logit Scaling Factor: Sensitivity factor for the Logit model used in parking
lot choice
● Logit Lower Limit: Defines the cutoff proportion for the parking lot choice
algorithm. If the benefit proportion of a parking lot is below the limit, no
vehicles will be assigned to it.
● Scale Total volume to [%]: This checkbox allows for modification of the
volume from all OD matrices used for the next Dynamic Assignment run
646 VISSIM 5.30-05 © PTV AG 2011