VISSIM 5.30-05 User Manual

11 Evaluation Types for Simulations of Vehicles
11.20 Special Evaluations (Discharge rate evaluation)
The option Special Evaluations contained in the Offline Analysis (File)
window (EVALUATION – FILES… - [VEHICLES]) enables any evaluations that have
to be entered within the input file directly.
In this section the evaluation of the discharge rate (which is the reciprocal of
the saturation flow) is explained.
A discharge in most cases will be measured at a stop line of a signal control.
In order to get reasonable values for the discharge rate the flows that are
measured need to be saturated (i.e. at least as many vehicles queuing as
can pass at green time).
Definition
For every discharge rate evaluation, a signal head and a data collection point
at the position of the signal head needs to be defined.
The discharge rate evaluation is then defined directly in the *.INP file (using a
text editor) like this:
EVALUATION TYPE DISCHARGE SCJ 1 SIGNAL_GROUP 2 COLLECTION_POINT 1
TIME FROM 0.0 UNTIL 99999.0
In this example, the evaluation refers to the green times of signal group 2 of
SC 1, and the times are measured at data collection point 1 which needs to
be located at the corresponding stop line. The time interval is usually set to a
value at least as large as the simulation period.
Configuration
No additional configuration required.
Results
The result for each discharge rate evaluation will be written to a separate file
(wit h ascending extensions starting with *.A00, then *.A01, *.A02, etc.).
A Discharge rate evaluation file (*.A**) contains the following information:
► File title
► Path and name of the input file (File)
► Simulation comment (Comment)
► Date and time of the evaluation (Date)
► Version no. with Service pack no. and Build no. (VISSIM)
► Details, e.g. Discharge at SC 10, signal group 4 (data collection point 10422)
► Data block:
- Each line refers to one green time (one cycle).
- The 1 st first column contains the simulation time of the start of the
green time.
558 VISSIM 5.30-05 © PTV AG 2011