Is the farm safe with "ride at own risk"?

"Ride at own risk", it seems too good to be true for some farm owners. Many are led to believe that if they place this sing up on their farm property that they are protected from getting sued if someone is hurt on their property. In actuality the sign cannot really protect the farm unless the waiver/ boarding agreement says so.
I asked Alison Rowe, Equine Attorney at Law ...

 Can a “ride at own risk” signs really protect barn owners when clients get hurt on their property? What happens if the client got hurt while not riding?
 She replied...
Yes.  Sometimes the signs can cover non-riders, depending on the language.  Boarding stables should get signed waivers and post the signs to be fully protected. Any one who enters the property riding or not should also sign the waiver.