VISSIM 5.30-05 User Manual

2D Visualization of Pedestrian Traffic
The visualization of traffic requires a substantial amount of computing time.
Turning off the visualization increases the simulation speed. Another option
to increase the simulation speed is to increase the interval of frame
updates for the visualization (Interval).
7.3.3 2D Display of Aggregated Values for Pedestrians (LOS)
As an alternative to the display of individual pedestrians, VISSIM can also
use well-known LOS schemes for display of aggregated values using a color
code.
This section describes the display of aggregated values for pedestrian traffic
on areas, ramps and stairways.
The color code is used to color each traversed polygon - which is either a
walkable construction element or a cell of a user-defined grid - according to
the value computed for this polygon. This value results from the online data
of the selected parameter. Alternatively to visualization of data gained by
update interval, also cumulative data display can be selected.
Selection: The LOS Schemes Provided for Aggregate Value Display
The two tables below list the LOS schemes and parameters provided in the
Aggregated Values - Configuration window. You can freely select a color for
each class.
► For the schemes, the upper interval limits of the classes are predefined
by scheme. The colors can freely be allocated to the value classes.
For each scheme, find a short description attached.
► For the parameters, you can freely select the upper interval limits to set
up the classes and assign a color to each class.
Scheme Walkways Stairways Queuing User-defined
Fruin
Fruin states as introduction that "the breakpoints that determine the various
levels-of-service have been determined on the basis of the walking speed,
pedestrian spacing, and the probabilities of conflict at various traffic concentrations".
Numerically the breakpoints are given as density and (alternatively)
flow. By defining both, density and flow limits, Fruin provides the planner
with the right strategy, as the level of service concept is meant to assess
walking quality up to capacity, where above capacity is tried to be avoided in
any case.
Weidmann
Weidmann follows Pushkarev and Zupan and the HCM in stating eight
criteria to assess pedestrian walkway quality. He refers to eight more
references to use these criteria to verbalize level limits given as densities.
User Manual © PTV AG 2011 419