In this situation, why do you have to wait before turning left?

Your answer is correct because in Germany, trams have priority over other vehicles, including cars that want to turn. When turning left at an intersection where tram tracks are present, you must wait for any approaching tram to pass before completing your turn. This rule ensures safety as trams cannot easily stop or swerve. Other vehicles, like the red car or the yellow vehicle mentioned, do not necessarily require you to wait unless they have the right of way or are otherwise blocking your path. The key reason to wait is always the tram's priority. Remember this rule when you see tram tracks or a tram approaching during turns in traffic.