VISSIM 5.30-05 User Manual

7 Simulation of Pedestrians
7.7 Fields of Application & Requirements
Over the years, the possibilities of simulating public transport passengers or
pedestrians have significantly been extended in VISSIM. Since the
Pedestrians add-on has been implemented you have – for each project – the
choice whether to apply the Wiedemann model which is included in the
standard installation or to prefer the detailed Helbing model instead which is
provided as Pedestrians add-on.
The various scenarios which can be dealt with require different model data
as you can see from the tables below.
Finally you can find a brief introduction to the modelling workflow for the
microscopic simulation of public transport passengers as pedestrians in the
network.
Main differences between the Wiedemann and the Helbing approach
Obviously, when pedestrians are modeled as a vehicle type (Wiedemann
approach) and when by this they are bound to move along user-defined
links, the spatial character of their trajectories is fixed in advance by the user,
it is an input to the model, not a result (except for the time at which a
pedestrian crosses which point of the link). If pedestrians can move freely in
two spatial dimensions (Helbing approach), their trajectories are not fixed in
advance, but calculated by the model. Therefore this approach is much more
flexible, detailed and realistic. However, there are situations, in which the
essential elements of the dynamics are produced by the Wiedemann model.
An example are projects, where pedestrians have no other role than to
impose interruptions to vehicular traffic at signalized intersections.
Level of Interaction:
Wiedemann Model
Pedestrians using crosswalks
in the road network
Pedestrians
add-on
Elements in the VISSIM network
Not required ► Links
► Pedestrians as vehicle type
PT passengers Not required ► PT stops
► PT lines as vehicle type
► Stop dwell time distribution or
number of boarding passengers
434 VISSIM 5.30-05 © PTV AG 2011