4 ms·
Unless there's a ramification of electromagnetism that I'm missing, cars that do the bulk of their braking through regeneration require their conventional brake
by InitialLastName 2y ago
Unless there's a ramification of electromagnetism that I'm missing, cars that do the bulk of their braking through regeneration require their conventional brakes to absorb far less energy, reducing the particulate matter generated.
- rnewme 2y agoHowever they're much much heavier, generating more tire and brake dust.
- galangalalgol 2y agoAnd unless the mass transit is tireless, it will be even heavier. Tire wear and this microplastics go up with the square of axle weight, so individual transportation is actually better from that standpoint.
- urban_winter 2y agoBut mass transit carries more people per wheel, and the weight of the bus does not scale linearly with the carrying capacity, so it doesn't automatically follow that "individual transportation is actually better...". I doubt that 50 EVs carrying one person each generate less tyre wear than one bus carrying 50 people.
- XorNot 2y agoRoad damage is a function of the power of 4[1] generally. A BYD bus weighs 18 tons and carries 32 people including the driver. [2] A BYD Atto 3[3] carries upto 5 people and weighs 1.8 tons unloaded. The proportional road wear function of the BYD Atto would be about 10 (1.8^4). For the bus it would be (18^4) 104,976. So the bus is 10,000 times more wear then the car. Per passenger it's 3000 wear units for the bus versus ~10 for the car. [1] https://en.m.wikipedia.org/wiki/Fourth_power_law https://en.m.wikipedia.org/wiki/Fourth_power_law [2] https://en.m.wikipedia.org/wiki/BYD_K_series https://en.m.wikipedia.org/wiki/BYD_K_series [3] https://ev-database.org/car/1782/BYD-ATTO-3 https://ev-database.org/car/1782/BYD-ATTO-3
- LargoLasskhyfv 2y agoRoads are for walking, bicycling and repair/cleaning/utility/emergency services. Deliveries go by subterran pallet-delvicery networks, to be last-miled by freight-cycles. Mass-transit by rails. Long-transit by maglev or air. Fuck cars!
- greenavocado 2y agoThis only works where the population has a very high average IQ (ability to understand second and third order effects of long expensive projects), no anti-social behavior (no corruption or theft in public works projects), with politicians whose interests align with the people. Unfortunately we live in a world where you will be stabbed to death and robbed for walking down the sidewalk holding a $20 bill openly in your hand.
- LargoLasskhyfv 2y agoThere are regional differences to that sort of behaviour.
- adrianN 2y agoThe average car carries 1.2 people, how many does the average bus carry?
- XorNot 2y agoThe 10 number is for literally one person, I'm also discounting their mass (this isn't a precision exercise). If you add 5 people to the car, call it 80kg per person so your you goto about 2.2 tons, then the damage number would be about ~24, but divided by 5 you end up with 4.8 (so a fully loaded car does about half the damage per person compared to one with a single occupant). The thing is of course on some level this is large scaling factors applied to small numbers - i.e. tires still don't fail that quickly anyway, neither do roads. Conversely it is actually weird to see that on this one metric, numerous self driving EV taxis is actually better.
- 2y ago
- kjkjadksj 2y agoSubways produce a ton of particulate too. Stations are always dusty and transit operators don’t seem to care about investing in better ventilation for the platform.
- silver_silver 2y agoI did some research and it seems this is already a problem with ICE vehicles because of the pickup/SUV trend. I don’t know how precise this data is, but apparently the top selling models in the US are [1]: 1. Ford F-150 (1,846–2,584 kg) 2. Chevrolet Silverado (2,029–2,272 kg) 3. Toyota RAV4 (1,530–1,640 kg) 4. Tesla Model Y (1,884–1,998 kg) 5. Honda CR-V (1,500–1,681 kg) 6. Dodge Ram (2,176–3,418 kg) 7. GMC Sierra (2,029–2,272 kg) 8. Toyota Camry (1,480–1,660 kg) 9. Toyota Tacoma (2,007–2,032 kg) 10. Tesla Model 3 (1,611–1,836 kg) They do seem to average 200-300 kg more than a comparable ICE model but as a whole they’re not tremendous outliers. [1]: https://www.edmunds.com/most-popular-cars/ https://www.edmunds.com/most-popular-cars/
- rnewme 2y agoVery interesting, thank you for sharing the numbers
- pstrateman 2y agoICE vehicles are getting larger because they're exempt from fuel economy requirements.
- kjkjadksj 2y agoYou can do the same by engine braking with a stick shift, tapping the break only to hold you still at the end if you really wanted to. And the car could be a 2000lb subcompact.