On my infrequent trips overseas I have taken some interest in the public transport systems and how they announce or display the stops, in particular for high volume metro systems.
In Australia and US they will announce or display the next stop, and also announce which side of the door will open to the platform or station (for trains).
In Taiwan there is an additional display above the door to show that this is the side that the door opens.
In Japan there is an additional display on the opposite door to show that the other door opens to the platform.
Just wondering if there is a redundancy in the interactions or a high user experience factor, or if this is just an entirely culture based design?