A recent comment from Rob mentioned:
a single strand of #8 fencing wire (electrified) stretched across the access road just where The Wasp starts.
It looks to me that the wire was intended to keep cattle inside the RAT area - the fences on the paddocks have been removed so they could end up wandering around the campus.
I didn't see any animals on my ride this time, but there's lots of cow shit over a large area.
I also haven't been able to find out how the cows get on to the track - any info on this would be appreciated.