VISSIM 5.30-05 User Manual

The Pedestrians Editor (Add-on)
Once e_alpha has been calculated – be it based on the static or the dynamic
potential – it is set into the driving force term and the sum of the driving force
and the social forces makes up for the acceleration of the pedestrian in that
particular time step.
7.1.8.13 The Service Point Selection Method
The dynamic routing of pedestrians can be performed by means of the
service point selection method.
The route choice method Service Point Selection is intended for these
scenarios:
1. Central queue:
To model a “first come - first served“ principle if there are multiple service
points that are all fed by a single queue. In reality this principle is often
used at post offices, airports or railway stations.
2. Immediate service point allocation:
As a (simple) decision model if there are multiple service points that all
have individual queues and a person needs to decide which queue to
join. Usually he tries to find the queue where he reaches the service
point as fast as possible, but this is not easily predictable especially if
there is a large number of queues and/or queuing people. This situation
can often be found at supermarket checkouts or ticket gates.
3. Survey/interview:
Single pedestrians walking by are asked to stop for a short time (e.g. to
answer a few questions of a questionnaire) before they continue their
path.
Pedestrians that are affected by this partial routing decision are directed to
either
► the central queue (on the queuing area with an optional dwell time where
the partial routing decision is located) or
► directly to one of the service points if at least one queue at a service
point is not longer than the value defined in the routing decision
parameters. If all queues are “filled”, the partial routing decision is
ignored (i.e. the pedestrian ignores the service points).
The service point is the first queuing area in the route sequence that contains
an intermediate point of the partial route. Each queuing area may have an
optional dwell time distribution assigned.
Modeling suggestions for the situations mentioned above
Direction of flow for all illustrations is from left to right.
Notes on the images below:
User Manual © PTV AG 2011 391