The staff report [0] seems pretty reasonable. Essentially manufacturers measure their tires using ISO 28580:2018 [1] and self-report to a future state tire portal. I wish that test was available when I last bought tires and look forward to seeing it next go round.
Undoubtably, consumers will quickly adopt tires in an exempt category like "Specialty tires, including certain off-road tires, low-speed tires, deep-tread tires, winter snow tires, space-saver tires, and temporary-use tires" and the unintended consequence will be that vehicle energy efficiency as a whole will decline.
> Undoubtably
We need a better argument than that.
HN are obsessed with the 'unintended consequences' argument against regulation, a very general idea applied to an actual situation, and as if people can't and don't anticipate and make effective plans.
The world turns, things work, regulations work - not everything in the world, but we accomplish a lot. My roads, medications, air traffic, etc. etc. work; people's planning and ideas succeeded.