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Re: Road Noise
David Staudacher wrote:
> On Tue, 23 Sep 1997 13:48:40 -0700,
> Christopher England <firstname.lastname@example.org> wrote:
> >But freeway noise rumbles through most of LA. The noise bounces off
> >clouds, gets bent by inversion layers; its all over. Nobody knows that
> >it can be controlled. QUIETER TIRES!
> How can you make a tire more quiet? Is it a different rubber
> formula? Different tread design?
> I think the kind of road surface can make a lot of difference
> too. Often when I'm on a freeway I notice how the sound can change
> dramatically according to the type of road surface changes. The
> noisiest always seems to be the standard grey concrete style. I have
> seen red-ish looking surfaces that are somewhat quieter. Country
> two-lane blacktop always seems to have a low, rumbling quality.
> The quietest freeway surface I have ever encountered is on the Belt
> Parkway in Brooklyn, New York. It runs beside the ocean and
> connects the boroughs of Brooklyn and Queens. It was resurfaced
> sometime in the late '80s with what I believe was a material
> containing large amounts of tiny bits of crushed glass. At least it
> appeared to be by the way it glistened at night. But, for whatever
> reason, it's the quietest stretch of freeway I've ever been on. It
> could well have been intentional too, for there are many hi-rise
> apartments along the Parkway. Perhaps Arline knows something about
> David Staudacher - email@example.com
> QUIET-LIST: Internet Mail List and Forum for discussion of Noise Pollution,
> Soundscape Awareness, and the Right to Quiet. Email: "firstname.lastname@example.org"
> To subscribe, email "email@example.com" with message "subscribe quiet-list".
> For info, send message "info quiet-list" to same.
On flat ground, I believe tire noise is easily the #1 source of noise
from autos. Uphill, engine and tire noise are about equal. For trucks,
of course, it's usually engine noise that dominates. Road surface is a
primary factor. A change from concrete to asphalt makes a big
difference INSIDE a car, so probably also on the outside. Has anyone
seen any data?
I made some measurements overlooking the I210 freeway in LA. Tire noise
reflected off the (nearly parabolic) center crash barrier seemed to be
the #1 problem. The noise was about the same no matter what vehicle was
QUIET-LIST: Internet Mail List and Forum for discussion of Noise Pollution,
Soundscape Awareness, and the Right to Quiet. Email: "firstname.lastname@example.org"
To subscribe, email "email@example.com" with message "subscribe quiet-list".
For info, send message "info quiet-list" to same.
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