People flow systems

How many different systems can you spot on this image, taken in the main station of Bern?

At least 4, may be even more. Depends how they are counted.
See below for my count ...






... let's start with the easier ones:
1) the classic signage system in stations (tracks, departure times, etc.)
2) the white lines for blind people
3) a new experiment in Bern: the yellow arrows trying to separate the walking directions (I am not sure about its success rate so far)
... and to end the tricky one:
4) the people counter for statistic & planning purposes. Can you spot the two tiny, round cases on the ceiling, each with 2 black spots. It's what these devices can do and absolutely high-tech inside.