We moved into the Northern part of Hamilton recently. Like you, the M50 noise was something I was nervous about (even took decibel readings prior to signing). I'm relieved to say that I can't hear a thing in the house, perhaps due the wooden frame structure, but its really quiet and peaceful. You would hear more traffic leaving near a country road. Depending on which way the wind blows, when you step outside you can hear it more some days then others. I understand sound barriers came with the panning permission. Can't see the M50 from where we are so can't really comment on that. Hope this helps. Best of luck