Thats some good info on the procedure. Of course the surface would have to be seriously taken into account, I mean some serous db abatement could happen with a newly paved road.If you are rating tyre (tire) noise, you can't do it from inside a vehicle as the noise from the tire will be very different inside a Honda compared to inside a Rolls Royce. Tire noise makes much more of a difference for EVs as there is no ICE drowning out the tire noise. Tire and wind are the two most prevalent noises for EVs.
As far as testing procedure, Google is your friend (or DuckDuckGo for anyone off the grid):
EU Tire Label Current status and challenges - Tyre Reviews and TestsSince the introduction of mandatory EU tyre labels in 2012, all tyres have to carry a label informing the consumers how well the tyre performs based on 3 key performance criteria. Prior to the EU ...www.tyrereviews.com
Still they don’t disclose which weighting is used…. Betcha A weighted for better numbers. All pertinent measuring info as well as road smoothness (in measurable standards) needs to be accounted for, to get real results across the board. But this is way down the list of things that are actually important….right? How sturdy the taco tray is way more important to me. ….