Thanks for sharing this graph! I've often wondered about tire vs. engine noise, and this answers all my questions in one succinct graph. From my point of view

Thanks for sharing this graph! I've often wondered about tire vs. engine noise, and this answers all my questions in one succinct graph. From my point of view, this data makes me optimistic, because I'm most bothered by noise when I'm walking beside the road on city streets, which are below 50km/h, and the graph promises a noticeable improvement in that area.