This appears to use the theoretical schedule, rather than real-time information. I live next to a busy tram line, and what I see through the window does not match what the site shows.
"VBB-Livekarte zeigt berechnete Positionen der Fahrzeuge zwischen zwei Stationen; falls kein Live-Fahrplan vorhanden, dann Position gemäß geplanten Fahrzeiten"
Translation:
It shows the calculated position of the vehicles between two stations. If there currently is no live data it shows according to schedule.
It goes beyond that in the Netherlands. A lot of bus lanes have their own traffic light system -- they have very small lights to show when they can go or stop. :)
For buses, there would be a normal traffic light controlling only a bus lane, usually labelled with the blue buses only sign. It's not very common, but I know a couple of cases in London.
You're probably complaining about the reliability of this map but it is actually often the case. In my district the buses frequently run the red lights.
Well, they don't actually follow streets. Looks like it's just the shortest distance between two stops, even if that goes right through a building or over water.
Works surprisingly well though, I only realized after a while.
"VBB-Livekarte zeigt berechnete Positionen der Fahrzeuge zwischen zwei Stationen; falls kein Live-Fahrplan vorhanden, dann Position gemäß geplanten Fahrzeiten"
Translation:
It shows the calculated position of the vehicles between two stations. If there currently is no live data it shows according to schedule.
http://www.vbb.de/de/article/fahrplanauskunft/vbb-livekarte/...