Tom
The keys to this concept are:
1. Visibility
2. A Clientelle/Membership with IQ's larger than the distance they can hit a lob wedge
The 1/18 corridor at St. Andrews works less because it is so wide (at least to anybody not-named Ian Baker-Finch), than because you can see the players coming towards you. Unless you fail test #2 above, it is obvious when you can and cannot hit your ball.
The courses I play mostly these days have a lot of shared or quasi-shared gorund, and it is amazing how easily the concept works. Of course, there is always rule#3 which is to take care of your vocal cords. Particularly in a heavy wind, being able to shout "FORE!!!!!!" fortissimo is a very valuable skill.
Rich