Ok, I concede that traffic can be seen, way off in the distance.
I suppose the whole point comes down to how 'close' is close? The previous road was a hundred-odd feet away, and literally went right past a big stone, by a couple of feet. That road was indeed close.
The A303 by comparison, is not particularly close IMO. It's far enough away that on many days one cannot even hear it. You cannot really see the road, but you can see vehicles (tops of cars, top half of trucks). It's far enough away that if one holds their thumb up, at arms' length, one can easily hide a truck's length completely behind it. Do other folk think that is close then? Seems so. I guess it's relative isn't it.
But IMO that's not particularly close - particularly as our initial/primary comparator here was the road that ran right past the monument.
I agree that it would be better if the 303 wasn't there / wasn't in a tunnel, of course.