VISSIM 5.30-05 User Manual

6 The Traffic Network
stop (specific to each PT line) one of these dwell time distributions is to be
assigned.
Option B: Dwell Time Calculation (Advanced Passenger Model)
To use the calculation of dwell times according to the advanced passenger
model, the following data needs to be defined in the PT PARAMETERS...
window by PT vehicle type (BASE DATA - VEHICLE TYPES... - EDIT - [SPECIAL] - PT
PARAMETERS):
● Alighting time: The average time it takes
for one passenger to get off that vehicle
(considering the number of doors, i.e. if
one passenger needs 6s to alight and
there are 3 doors, the alighting time to be
entered is 2s.)
● Boarding time: The time it takes for one
passenger to board (considering the
number of doors as described above).
● The Total Dwell Time may be calculated
by using either the Additive or the
Maximum method.
If there are exclusive (one-directional) doors then only the maximum out
of the total passenger boarding and alighting time should be used,
otherwise the sum of both.
● Clearance time: The time needed for the vehicle to stop and to
open/close the doors.
● Capacity: The number of passengers the bus or tram can hold. If
capacity is reached no more passengers can get on the vehicle.
Other input data:
► Initial occupancy of the PT vehicles (cf. Start Times in PT Line window)
► Passenger flows for each PT stop (cf. section 6.5.1)
► Alighting percentage and Skipping possible option in PT Stop Data
window.
Once all this data is provided, VISSIM calculates the dwell time of a PT
vehicle at a stop as follows:
1. Determine the number of alighting passengers (defined by the
percentage of passengers on board that are alighting).
2. Determine the number of boarding passengers (all waiting passengers
whose list of acceptable lines include the line of this PT vehicle and
taking into account its maximum capacity).
3. Determine the time required for alighting (computed as the number of
passengers alighting multiplied by the average alighting time).
4. Determine the time required for boarding (computed as the number of
passengers boarding multiplied by average boarding time).
5. Determine the total passenger service time (computed as the sum of
clearance time plus alighting time plus boarding time).
256 VISSIM 5.30-05 © PTV AG 2011