We use the orange safety mesh to isolate work areas when we can, all depends o the circumstances of the job site. Gotta tell you makes no difference public just step over it!
Reckon you'dhave to put up razor wire with an electrified top wire to stop them and even then.... We just try to isolate the drop zone as best we can, that particular job was more of a demo of what we could do for one of the Councils so we went a bit over board, normally in such an isolate location with very little chance of people wandering in we would have put out cones and relied on the groundie to kepp the area clear. Never cut without clear call from below.
SF