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biophysboylast Wednesday at 3:44 PM3 repliesview on HN

Is that true for slower moving vehicles? I can't imagine there's a lot of brake dust generated by stopping & starting in the 0-10 mph range.


Replies

lonelyasacloudlast Wednesday at 4:44 PM

Afraid the intuition is somewhat incorrect.

Similar to with tire wear what's important to emissions is the amount of force that has to be applied to decelerate and how often it occurs. At highway speeds it's far less of an issue, but in slow speed urban environments with lots of stop start driving and high vehicle densities it's a real problem.

See for instance https://uk-air.defra.gov.uk/assets/documents/reports/cat09/1...

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nabla9last Wednesday at 4:06 PM

Tires and brakes. With EV's this gets relatively worse because they are heavier.

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MSFT_Edginglast Wednesday at 4:41 PM

Folks in the comments will say "not really" for EVs because of better control and lower speeds, but if you've ever driven in Manhattan, you'd know it's often light-to-light drag racing at times which with an EV and a heavy foot will undo a lot of the regen braking via stress on the tires.