Ummmm . . . no? I just checked my Streets & Trips software, I don't see a South Road anywhere near Gun Road. Do you mean South Rolling Road, maybe? The software shows it ending abruptly in the middle of nowhere, but S&T doesn't show paved surfaces that aren't accessible to cars.

I might not want to avoid the Gun Road climb, anyway. It will be my arch-nemesis, my white whale . . .