vs | plus

This processing step is about finding the next traffic streams that should be switched to green and the conflicting ones to red. In stage control, this is the step of finding the next stage from the stage sequence. 

In vs | plus, a new " stage" is put together dynamically, depending on the parameters, requirements and priorities of the traffic streams. There are two steps involved.

• Determine main traffic stream: Several traffic streams can be found using the main stream parameter (control rank-dependent: main series). The most important criterion for being found is the request for a traffic stream. This mechanism is designed in vs | plus in such a way that several traffic streams can be found during this search. In such a case, those found are sorted according to their priority (calculated from the class, level and priority flag). Starting with the first in this sorted series of traffic streams, all conflicting ones are deleted from the list. The next main traffic streams are then found. 
  It may also be the case that no new main stream is found. In such a case, the idle screen comes into effect. Depending on the parameterisation, it can be defined, for example, that the traffic streams in the main direction are to be switched to green. 
• Minor series: A minor series can be defined for each traffic stream that is parameterised in the main series. Several compatible traffic streams can be entered in this secondary series for each main traffic stream. Starting with the first traffic stream from the list in the previous step, the secondary streams that have a requirement are searched for. If there are no conflicts with the main streams and the current situation, this traffic stream is designated for switching. 

This finds the next traffic streams to switch on. These found traffic streams are checked again each time vs | plus runs (every second). If there is a new application, for example due to an emergency vehicle, the list can be completely rebuilt. Other traffic streams have a higher priority. Depending on the parameterisation, even a transition that has already been initiated can be cancelled.