VISSIM 5.30-05 User Manual

Signal Controllers
A signal head is the actual device showing the picture of the associated
signal group. Signal heads are coded in VISSIM for each travel lane
individually at the location of the signal stop line. Vehicles wait approximately
0.5m behind a signal head/stop line that displays red. Vehicles approaching
an amber signal will proceed through the intersection if they cannot come to
a safe stop in front of the stop line. Optionally an advanced calculation
method can be used for VISSIM to calculate a probability for whether the
vehicle should continue through amber or not using three values of the
Driving Behavior Parameters (see section 5.4).
Signal indications are typically updated at the end of each simulation second.
If the controller module for VISSIM is equipped for switch times down to 0.1s,
VISSIM is able to reflect this behavior. However, this is dependent on the
controller type.
Signal head coding allows for the exact modeling of any kind of situation.
This includes the ability to model different signal groups for different vehicle
types on the same travel lane. For example, modeling a bus traveling in
mixed traffic but yielding to its own separate signal phase is possible with
VISSIM by selecting the appropriate vehicle classes for each signal head.
With any SC, all conflicting movements that can run at the same time need
to be secured using priority rules (cf. section 6.6.1).
6.7.1.1 Creating
For coding Signal heads, a Signal controller has to be defined and Signal
groups are required, cf. section 6.7.3:
1. Select the Signal heads mode.
2. Select the link on which it is to be placed.
3. With a right click, define the position of the signal head on the selected
link.
4. Edit the signal head properties (cf. section 6.7.1.2).
5. Confirm with OK.
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