Every light signal control is different. Some traffic lights always change in the same rhythm – in this case, forecasting is easy.
However, many traffic lights react dynamically depending on different influences: pedestrians who press for the green man, buses and trams that are given priority at the junction, or heavy traffic from one direction or the other. In such cases, forecasting is more difficult and sometimes only possible at short notice (or even not at all if the data from the traffic lights is not transmitted quickly enough).
Uncertain forecasts are displayed in grey in the app. Red and green are shown lighter and darker. This often only affects parts of the forecast and there are, nevertheless, certain red and green areas that help you to choose the correct approach speed.