VISSIM 5.30-05 User Manual

● Comment: Text to identify the
simulation run. The comment
line is stored in the input file and
included in both printouts of the
network and in output files.
● Traffic regulations: Specifies the
standard driving side (e.g. Great
Britain and Hong Kong use Leftside
Traffic). It affects the
driving behavior on motorways
(overtaking in the fast lane), the
placement of the opposite
direction of a link and the
placement of bus lay-bys.
● Period: The period of time to be
simulated. Any warm-up times
to fill up the network must be
included here as well.
Simulation of Vehicles and Pedestrians
● Start Time: The time shown on the clock at the beginning of the
simulation. In order for it to be displayed, the Time option needs to be
selected (see VIEW - STATUS BAR). For Dynamic Assignment applications,
the Start Time is used to generate the traffic demand of the OD matrices
at the right time. The time needs to match the settings in the matrix files.
● Start Date: Can be used to specify a date for signal controllers that have
a date-dependent logic. This date is passed to the controller DLL.
● Simulation Resolution: The number of times the vehicle’s position will be
calculated within one simulated second (range 1 to 10). The input of 1
will result in the vehicles moving once per simulation second. An input of
10 results in the vehicles’ position being calculated 10 times per
simulation second thus making vehicles move more smoothly. We
recommend 3 or more time steps per simulation second. The change of
simulation speed is inversely proportional to the number of time steps.
On a fundamental level the simulation is a numerical integration of the
system of coupled differential equations. The intended solution would be
a continuous integration.
This means that the numerical solution (the simulation) in time steps is
only an approximate solution of the equation system, which gets worse
when the length of time steps in the integration process is increased.
This fundamental level of the simulation on the operational level receives
"orders" from a supervising level within VISSIM.
An example for such an order is: "Destination area 1 is reached, the next
destination area is area 2".
User Manual © PTV AG 2011 451