Sound walls, as implemented in SV, don't reduce noise, they merely displace it. I don't understand why they didn't choose only sound-absorbing materials... but

Sound walls, as implemented in SV, don't reduce noise, they merely displace it. I don't understand why they didn't choose only sound-absorbing materials... but they didn't. The noise in Kevin Moran Park (next to Hwy 85), originally negligible, became a serenity-killing din.