VISSIM 5.30-05 User Manual

● Normal distribution: A normal distribution
is defined by the mean value and
the standard deviation (in seconds).
Defining the standard deviation as 0s
creates a constant dwell time. If a
negative dwell time results from the
normal distribution it is automatically
cut to 0s.
Distributions
● Empirical distribution: An empirical distribution is defined by providing a
minimum and a maximum value and any number of intermediate points
to build a graph of various shapes (similar to the definition of speed
distributions, cf. section 5.2.1). Thus any type of distribution can be
defined.
For the allocation of dwell time distributions to stops, cf. section 6.5.2.5.
5.2.7 Location Distribution (PT Boarding/Alighting Pass.)
The allocation of alighting passengers to the doors of a PT vehicle can be
defined through a Location Distribution via BASE DATA - DISTRIBUTIONS -
LOCATION....
It shows how the total number of boarding and alighting passengers is
spread over the whole length of the vehicle. Each door of a vehicle dwelling
inside the PT stop (which is used for boarding and alighting) calculates "its"
part of the total vehicle length:
► half-way to the adjacent door(s) respectively
► full distance to the front/rear of the vehicle.
To each share of the total vehicle length, the increase in y direction over this
part on the x axis of the location distribution is assigned as percentage of
passengers to the respective door.
► The alighting location distribution can be selected per PT line stop:
Double-click on a red PT stop in a selected PT line, cf. section 6.5.2.5.
Default is no distribution which assigns the same percentage to each
door (regardless of the position).
► The boarding location distribution can be selected for each pedestrian
area with PT usage separately in the Boarding location selection list, cf.
section 7.1.4.3.
Default is Nearest door which assigns each boarding passenger to the
door which is situated most closed to him and can be reached quickly.
VISSIM provides five predefined distributions:
● Uniform: linear over the whole length of the vehicle
● Center: more passengers alight near to the middle of the vehicle
● Front: more passengers near the front
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