Just an aside - the comments about the number of older courses where roads are in play suggested to me that the game must have been a less "precious" thing back in earlier times (simpler, less litigious times, as Tom P says.)
I mean, I assume courses today aren't being built that way primarily for legal reasons, but also because few golfers (either at a new private club or high-end public course) would accept having their flow, their game, or their golfing experience "interrupted" that way, or their vistas/views "marred" that way.
I know the roads mentioned all must've been much less busy back then than today, but they were still there, as was at least some kind of traffic...but no one seems to have given them much thought at all. Maybe it's this kind of modern-day "preciousness" that would keep Merion off the "best new" list, while preferencing instead the large-scaled courses and those with open vistas.
But on second thought, maybe "precious" is a negatively loaded word. Maybe I could just as easily have said this modern-day "love of nature and of the natural" that stems from having less and less of it in our daily lives.
Just an aside; just thinking out loud.
Peter