[beamatronic]

On highway 85 near Cupertino a few years ago they did something called “microgrooving” and it made a huge difference in tire noise, even inside your car. It’s dramatically quieter when you suddenly hit that section.

[m463]

What also helps immensely both in noise and road wear is that no trucks are allowed on 85.

They also designed in sound-absorbing walls.

[vbuwivbiu]

I couldn't find reference to this technique could you go into more detail please ?

[beamatronic]

Here’s a little detail - https://www.mercurynews.com/2015/03/02/roadshow-groovy-highw...