There are various use cases for stochastic distributions in Vissim, for example the desired speed of vehicles on certain network objects or the weight and power of HGVs. Using Vissim, you can model any type of stochastic distribution.
You can also define general distributions in which the value range and usage are user-defined (Using general distributions).
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Using desired speed distributions
Using location distributions for boarding and alighting passengers in PT
Defining occupancy distributions
Using 2D/3D model distributions