These screens are installed to show advertisements on public transportation buses at Mersin for a while now, and I was thinking that they are probably powered by embedded Windows. Today, when I was coming to campus, system produced an error on the boot loader screen and I’ve noticed it is running Debian! (Click on the image to see its bigger version)
I’m not sure whether the drivers or the owners of these buses are aware of this, but they are showing a good example of making money by using open source :) Congrats for their clever choice!