Comment by ErroneousBosh

In general the emergency services would rather come out for something that sounds on the face of it stupid ("This sign is hanging down above the road and flapping in the breeze, can you come out to it?") and deal with it with plenty of time.

Far better than getting the call "This sign has come down and chopped a bus in half, and then four cars have run into the back of the wreckage".

Build the fence at the top of the cliff, not the hospital at the bottom.