VISSIM 5.30-05 User Manual

6.7.1.3 Editing
1. Select the Signal heads mode.
Signal Controllers
2. Right click in the network display to call the Signal heads list. For each
signal head, the list contains the SC no., the name and no. of the signal
group and the name and no. of the signal head.
3. Select the signal head you would like to edit.
4. Click the ZOOM button to zoom into the network display, if applicable.
5. Click the EDIT button to modify the signal head’s properties (cf. section
6.7.1.2).
6. Confirm with Ok.
Alternatively, you can click the DELETE button in step 5 to delete the selected
signal head in the network.
6.7.2 Detectors
Real life vehicle/pedestrian detection is achieved using various methodologies
including induction loops, video cameras, push buttons, track circuits
etc. VISSIM models each detector type in the same way: as a network
element of user-definable length.
A message impulse is transmitted to the signal controller as soon as a
vehicle reaches this element with its front and another one when it leaves it
with its tail. This information is then interpreted by the signal control logic.
Detectors on pedestrian links
Prior to VISSIM 5.20-06, only the presence at the end of the controller time
step was passed to the controller. Now, detectors on pedestrian links detect
changes between occupied and free between subsequent time steps, and
pass this data to the controllers as "front ends / rear ends".
Thus, the assigned sound file can be played, when a pedestrian arrives on
an empty detector, too.
6.7.2.1 Creating
To define a new detector on a link follow the steps outlined below:
1. Select the Detectors mode.
2. Select the link the detector is to be placed on.
3. Right-click within the link where the detector should start. The new
detector will be shown with a default length of 5 m and the Detector
window appears.
4. Set the detector properties (see section 6.7.2.2).
5. Confirm with Ok.
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