I agree that the LS is so quite, it is only road noise at 60mph you hear, and that UK roads are so naff the harsh surface creates too much noise.
I will say that went out in a Golf Blue Motion the other day (one of my sales teams car), and the road noise was almost as good as the LS (but then it has narrower tyres)
One thing to remember is that the LS was designed before the advent of computer technology used extensively in car design, so I suspect newer Lexus cars will have the upper hand in better acoustic isolation, and there would be 60 computers working on the problem, not 60 engineers.
Not that that would make any difference? (60 computers). Japanese folk can get quite OCD about stuff.
I saw a Parking assistant picking up cig ends with chop sticks-white gloves on.......once.
Place is clean!
Computers are only as good as the input. No substitute for experience?
The Ser 4 is pretty silent; no amount of computers can deal with our grit-grade road surfaces. I live 100 yards uphill from A4 and it's like the sea! No engine noise, just tyres. When I asked what had happened to the wonderful 'Silent surface' they had trialled about 15 years ago, I was told it hadn't proved durable! Yet they resurface every 2 years..... Whilst in Germany.......properly made roads.
I suspect 'Fixed contracts'/Lowest quote comes in here somewhere?