Acoustics play a big role. I used to live a mile from a freeway but the ground sloped gently up towards my house and, being San Diego, there weren't a lot of t

Acoustics play a big role. I used to live a mile from a freeway but the ground sloped gently up towards my house and, being San Diego, there weren't a lot of trees to absorb the noise. On many nights it was about as loud as standing a block from the freeway. It varied based on temp, humidity and wind direction.