We have stayed there for a couple of nights, did not notice any A1 noise ,part of the site nearest the booking in area is the furthest away from the A1, the further you go into the site the closer to the A1.
Not a bad dog walk , it runs behind the site, if you walk far enough you will come to a railway crossing, take heed watch that the signal lights show red in both directions as the trains pass by about 100 mph .
Their are two toilet and shower blocks, Lots of wooden static vans some looking quite expensive , small fishing lake on site,off site a very large private lake on the boundary ,If you happen to climb up the bank which hides the A1 road looking down towards your left , you will see a open sewage works,must admit did not notice any odours.
Their is a seat positioned on the top of the bank, so that you can watch the traffic, we sat their for about 1 hr on a Friday afternoon, it turned out to be a very busy, with some scary moments with overtaking .
Its very handy pitstop acess from both sides of the A1,