Selecting the number of simulation runs and starting simulation

Tip: To gain an impression of the stochastic distribution of results, run multiple simulations using different random seeds and compare the results (Defining simulation parameters).

Notes:   When using the 64-bit Vissim edition up until Vissim 10 with large networks and numerous vehicles, you might obtain different simulation results than with the 32-bit program version due to its different rounding behavior. From Vissim 11, Vissim is available as a 64-bit edition only. Opened lists might reduce the simulation speed. When you close opened lists, this may increase the simulation speed.

Set the simulation parameters before you start a simulation run (Defining simulation parameters). You can then run a simulation in the Simulation single step or Simulation continuous mode.

1.  On the Simulation menu, click > Continuous or Single Step.

Vissim initializes the simulation. Initialization might take a while, if you are using a large network. In this case, a window opens displaying the progress of initialization.

2.  When this window is displayed, but you wish to cancel initialization, click the Cancel button.

3.  If messages are shown during the simulation, follow the instructions and make the settings required.

You can use the Simulation toolbar to control simulation runs:

Symbol	Name	Description	Key
	Simulation continuous	Starts continuous simulation run or switches from Simulation single step mode to Simulation continuous mode.	F5
	Simulation single step	Starts simulation in Simulation single step mode or switches from Simulation continuous mode to Simulation single step mode or executes the next single step.	F6
	Stop simulation	Stop started simulation run. Result attributes of the current time interval might not be updated immediately, but only at the end of the time interval.	Esc

Convergence may already be reached before the number of simulation runs is completed that has been defined in the simulation parameters, in the Number of runs box. In this case, you can select the Behavior upon convergence: (Attributes for achieving convergence).