VISSIM 5.30-05 User Manual

11 Evaluation Types for Simulations of Vehicles
11.4 Queue Counters and Vehicle Stops
The queue counter feature in VISSIM provides as output the
► average queue length,
► maximum queue length and
► number of vehicle stops within the queue.
Queues are counted from the location of the queue counter on the link or
connector upstream to the final vehicle that is in queue condition. If the
queue backs up onto multiple different approaches the queue counter will
record information for all of them and report the longest as the maximum
queue length.
The back of the queue is monitored until there is not a single vehicle left over
on the approach that still meets the queue condition, though other vehicles
between the initial start and the current end of the queue do no longer meet
the queue condition (having a speed > End speed).
Queue length is output in units of length not in number of cars.
The queue is still monitored as long as there is a “queue remainder” - even
if the first vehicles directly upstream of the queue counter are not in queue
condition any more.
The maximum queue length reaches to the next queue counter located at
an upstream position. Queue counters created automatically for node
evalulations are not regarded.
Definition
Queue counters can be placed at any position within a link/connector. The
most suitable position is at the stop lines of a signalized intersection.
To define queue counters follow the steps outlined below:
1. Select the Queue Counters mode.
2. With a single left mouse click select on the link the location of the queue
counter.
3. Define the location of the queue counter within the link by clicking the
right mouse button at the desired location. Queues will be measured
upstream from this location.
4. Enter a number in the appearing window and choose OK.
Configuration
In order to get the desired output data additional information is needed. This
is to be provided within the Queue Measurement - Configuration window
(see below) which is accessible by pressing the CONFIGURATION button in
EVALUATION – FILES… once the option Queue Length is active.
The following data can be defined:
508 VISSIM 5.30-05 © PTV AG 2011