VISSIM 5.30-05 User Manual

8 Simulation and Test
When testing VS-PLUS control strategies, usually an SC/Detector protocol
is generated for each test scenario. It is recommended to name each *.LDP
file like the particular macro test file (*.M_I) that was used for generating
the *.LDP file.
8.2.3 Using Batch Mode Operation for Test Runs
In addition to manually defined detector actuations, VISSIM can also analyze
a series of special test cases.
This feature is especially helpful to answer questions like:
► How does the tested logic react to exceptional situations such as
repeated demand for all signal phases with a PT preemption event at a
certain time?
► What happens if the preemption event occurs one second later or two
seconds earlier, etc.?
The batch mode operation discriminates between signal groups (phases)
with specific detector actuations (test phases) and signal groups (phases)
with constant demand or recall operation (recall phases).
In an output file *.SLO, VISSIM logs all signal changes that occurred during
the test run. This output file is used to prepare the following analyses:
Red Time
Distribution
Green Time
Statistics
Time-Time-
Diagram
Waiting times for test phase vehicles depending on the cycle
second in which the preemption call occurred
Green time average and distribution for all signal groups
(phases) depending on preemption time point, required
green time and volume to capacity ratio
Diagram showing green time of up to four signal groups
(phases) against the time of preemption
VISSIM requires a configuration file *.SLF as input. This file has to be
created with a text editor outside of VISSIM according to the example shown
below. Note that VISSIM ignores comments (text following two dashes ‘--‘).
The presence and sequence of the key commands at the beginning of each
line is important.
Example
The following example analyzes the impact of a light rail preemption event
between simulation second 1 and 10 on the signal operation. Light rail trains
place their preemption call via detector #901 and checkout via detector #902.
The average queue length at the stop line defines the number of vehicles
usually queued at the beginning of the green interval. It is assumed that the
PT vehicle is in the middle of the queue and gets an additional delay of 2
seconds per vehicle in front of it. Detector actuations for the recall phases
can be set to repeated (ALF/LFD) or continuous (AST/STE). Multiple
460 VISSIM 5.30-05 © PTV AG 2011