The Pit Lane Penalty app that some of us have been testing for a few weeks will now be
MANDATORY for all drivers, starting from Spa.
The app warns you when you cut the track, and on your fourth warning, you get a drive through penalty, which must be taken within the next 3 laps. You can't take your penalty at the same time as a pit stop.
You can download the app and read more about it in this thread:
http://www.assettocorsa.net/forum/index.php?threads/a-pit-lane-penalty-app-for-repeated-track-cutting.17852/The latest version is 0.5 (which I just uploaded tonight, Wed night).
I will be able to tell on the server who's not using it. If you don't use the app, you'll get a 5 point penalty in the standings.
And to be clear, it's about immersion and realism, rather than suspecting that anyone's been cutting the track.