When testing a vs | plus parameterisation, the aim is to check the traffic-related requirements. Whether this test is carried out on the test bench, with the help of a simulation tool or on a control unit is irrelevant.
The first element when testing a vs | plus parameterisation is the signal timing plan.
Figure 92: Example signal timing plan
This allows you to see the result of the vs | plus process. It corresponds to what a road user sees on the road.
What is not visible from the signal timing plan are the decisions made by vs | plus that led to the result. To get this information, you need the process data from vs | plus. With this data it is possible to look into the vs | plus core. From the large amount of vs | plus process data, here is a brief description of the most important ones.
- Active flag: This indicates the status of the idle state sequence. It is output for each of the three vs | plus partial nodes. This allows you to recognise whether the partial node is being switched by requests or whether an idle state is active.
- Main pointer: In each of the priority elements that are active in this supply, there is a main and minor series. For each of these main series, there is a main pointer that points to the next traffic stream that has a request and is to be considered next. This makes it possible to know the next main stream and its defined minor streams that are to be switched.
- State: The traffic stream state is an indication of the current purpose of a traffic stream. This shows whether a traffic stream is closed (red) or open (green). Within these two areas there are further gradations. The most important data for understanding what is happening in vs | plus is the state of each traffic stream.
- Waiting time of a traffic stream: As soon as a traffic stream receives a request, a traffic stream wait time is started. It is the basis for further decisions that are made in the vs | plus core. It is used, for example, to determine from when a traffic stream is processed in the upper level (maximum waiting time).
- Priority level, priority class: The priority element in which a traffic stream is processed can be identified from these two values.