4.4 DaySim-Visum Linkage

PTV Visum procedures generate highway and transit skims that are stored in the model version file. The skims are converted to ASCII text files using Visum's Python API and are input to DaySim, which simulates person trips and outputs them into .tsv list format (_tour.tsv, _trip.tsv etc.). In addition, DaySim also writes out a simple trip list “Tdm_trip_list.csv” in \Scenarios\{SCENARIO_NAME}\Output\DaySim directory. This file just has origin TAZ, destination TAZ, mode, departure time, arrival time, trip duration, purpose, and VOT category. This trip list is transformed into time-of-day, mode, and purpose specific highway and transit matrices for assignment using Visum's Python API, which imports final trip tables into Visum for assignment.