As I am planning to get a unit at Avela, I actually went to the site to gauge the noise from highway. Based on my experience camping there for about 60mins (2  separate times), lol, the sound from highway is actually not that bad (can hear sound but it is not disruptive). I think it is comparable to the sound of vehicles in the taman road.  In fact, based on my experience living in terrace house, noise from neighbour's A/C outdoor unit or our ceiling fan could be louder and much more notable. During that two visits, I am actually more concerned of the aircraft noise instead of the highway. Maybe residents of SWAN or LIVIA can give more accurate input since they are in the proximity.