If they want to drive in Germany, they should surely know the local driving rules (including the green arrow sign), otherwise there'd be little point in a self-

If they want to drive in Germany, they should surely know the local driving rules (including the green arrow sign), otherwise there'd be little point in a self-driving car. And since there is no way of not going right at this point there should be no problem. But I don't think there is much self-driving in city traffic yet. Especially rules about who has to yield where are not always governed by signs visible directly to every driver (e.g. Verkehrsberuhigter Bereich).