Some years ago I added the functionality to display signals that the train is going past, to be displayed in the cab view. This is of course needed when driving a train manually using the cab view - for the same reason that the real train driver needs to see the signals... below are some examples of how signals are displayed...
Here the train sits at an Hp00 signal
Distance signals too...
and one has to handle the distance signal combined with a main signal...
Hp0 - the "Dunkelschaltung" rule means the distance signal is all off
and finally the shunting signals:
The images displayed in these cab views predate the installation of the signals on the layout - I need to update them!