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“Car tyres produce vastly more particle pollution than exhausts, tests show”

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  1. chdot
    Admin

  2. cb
    Member

    These claims were somewhat debunked on More or Less:

    https://www.bbc.co.uk/sounds/play/m0018gql

    Posted 1 month ago #
  3. toomanybikes
    Member

    Meh, More or Less more or less just said tyres aren't 2000x more deadly than tailpipe emissions in the real world today. Which was obvious before and after that article.

    An actual ratio would be great to contextualise electric cars. However, the key bit from the article I thought was the huge variance across tyre brands. Tyre compounds would presumably be a good thing to regulate assuming that ratio isn't tiny.

    Will have nightmares about their earlier attempted simplification of medians to say "average median". Ew.

    Posted 1 month ago #
  4. steveo
    Member

    I read something interesting, tyre wear is likely to be the largely the same on ev but brake wear should be much reduced as they operate more like a dodgem. Basically when you press the accelerator it works the same but when you come off the power instead of coasting the car goes into regeneration mode and starts to charge so its easier to control your speed.

    Foot down accelerate, lift off decelerate with a bit of practice it should be much easier to drive in town at a fixed speed without involving the brakes.

    Posted 1 month ago #
  5. toomanybikes
    Member

    Suspect weight overblown ( more relevant for buses?). Just that the ratio goes to infinity regardless of numerator when you have no exhaust!

    Posted 1 month ago #
  6. Yodhrin
    Member

    Weight is very much a factor in road wear, American road engineers use their "fourth power rule(of thumb)" that says "damage to the roadbed is proportional to the 4th power of the axle load of the vehicle" with the example that double the weight will increase the damage you do to the road by a factor of 16 - that seems like the extra weight of battery packs in EVs will definitely have an impact. I don't see any reason you wouldn't find a similar relationship between the weight and the wear on tyres, perhaps even more pronounced depending on the relative durability and wear characteristics of synthetic rubbers vs tarmac.

    But that's just me blethering from a position of mostly ignorance so I might be way off :P

    Posted 1 month ago #
  7. steveo
    Member

    I kind of assumed evs would be lighter but no there a few hundred kilos heavier by the time you add the battery and the reinforcement for the extra weight of said batteries. Although I suspect road wear of a two tonne ev is still significantly lower than the road wear from the big Lothian buses!

    Posted 1 month ago #
  8. chdot
    Admin

    “significantly lower than the road wear from the big Lothian buses!”

    Yes but

    One point about buses is that they can/should carry more people.

    On a sideways note -

    Remember when bus stops had very visible waves of tarmac?

    Have they put concrete bases in or are they using a less flexible tarmac?

    Or both?

    Posted 1 month ago #
  9. steveo
    Member

    Yeah I totally agree just pointing out that a marginally heavier car isn't suddenly going to produce the waves you used to see.

    I'm not sure what happened to them, the bus stop beside saughton park used to be deadly but its mostly fine now.

    Posted 1 month ago #
  10. fimm
    Member

    Some bus stops still have damage: the one on Dalry Road opposite Lochavore is particularly bad.

    Posted 1 month ago #

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