Originally Posted by 
Arapiles
				
			 
			It applies to any member of the public who comes onto your land, invited or otherwise.
True story apparently - a man moved to our district and decided to build a terradome house (i.e., a dome covered in soil).  Ecological etc.  Some young people I know were out mucking about on a Saturday night and decided to drive up and over the house.  Whilst they were driving over the house their car fell into a hole that the terradome owner had dug to find a leak in his roof.  The kids had to front court.  One of their dads got a good barrister down from Melbourne and the upshot was that the home owner got in trouble because he'd left a gaping hole where a member of the public could fall into it and hadn't taken any steps to fence it or erect warnings.  I presume that there were no fences around the property at all, as I doubt that the kids would've gone through a gate.  
Mantrap - if I hit a stake like that in a car at speed I think that it'd do damage to the car and the people in the car.