Del Sur is a community with lots of new/ongoing development. It is not particularly near a freeway (no freeway views or freeway noise), but it is close enough to be convenient (about 5 miles from either I-15 or SR-56). I agree that both of these freeways are pretty congested, but still do-able. San Dieguito Rd provides an alternate route to the west.
From what I understand, the land was owned by Black Mountain Ranch group for 25 years or so prior to development starting, so BG is correct about that part.
Total aside, but I have to mention it… a few days ago I remarked that the “Deer Crossing” signs on Paseo del Sur were probably a bit unnecessary at this point, given all the development in the last few years. Less than 24 hrs later, I was jogging in the area and saw deer tracks at several spots.
(Personally, I love living in 4S/Del Sur.)