In reply to Ian McNeill:
> You don't see signs in cities warning country visitors about knife attacks, muggers and the location of the nearest red light district do you ?
>
> or did I miss them the last time I visited a city ....
You're telling people you don't have much logic!
Muggers are moveable objects. Where can you put a sign to warn people if they move around all the time? Now you're also telling people that you're not observant. For instance, the police do actually put up posters in certain places such as car parks to warn people not to leave valuables in their cars if they're cime blackspots. Or something in the line of 'beware of pickpockets'.
In London, you do see signs telling you which way to get to Soho. Again, you're not very observant.
For mountains, majority of the time, they're not moving or changing location much. It's easier to put a sign or two up.
In fact, just at Christmas, I walked up Carrnantouhill, the highest Irish mountain. There was a sign on a ridge a few yards from the summit cross; warning people it wasn't a descent route. The reasoning was that the ridge was probably used by climbers topping out. A track was formed. A great deal of walkers mistake it as a possible descent route. So the Kerry Mountain Rescue team put up a sign to warn people. I thought it did the job especially when it was misty even though I knew perfectly well which direction to get off.