http://citycyclingedinburgh.info/bbpress/ CityCyclingEdinburgh Forum » Topic: “Car tyres produce vastly more particle pollution than exhausts, tests show” en Sun, 31 May 2026 08:40:02 +0000 http://citycyclingedinburgh.info/bbpress/topic.php?id=20976#post-361604 Mon, 27 Jun 2022 09:26:42 +0000 fimm 361604@http://citycyclingedinburgh.info/bbpress/ <p>Some bus stops still have damage: the one on Dalry Road opposite Lochavore is particularly bad. </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=20976#post-361588 Sat, 25 Jun 2022 18:56:51 +0000 steveo 361588@http://citycyclingedinburgh.info/bbpress/ <p>Yeah I totally agree just pointing out that a marginally heavier car isn't suddenly going to produce the waves you used to see.</p> <p>I'm not sure what happened to them, the bus stop beside saughton park used to be deadly but its mostly fine now. </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=20976#post-361584 Fri, 24 Jun 2022 21:41:01 +0000 chdot 361584@http://citycyclingedinburgh.info/bbpress/ <p>“significantly lower than the road wear from the big Lothian buses!”</p> <p>Yes but</p> <p>One point about buses is that they can/should carry more people. </p> <p>On a sideways note -</p> <p>Remember when bus stops had very visible waves of tarmac?</p> <p>Have they put concrete bases in or are they using a less flexible tarmac?</p> <p>Or both? </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=20976#post-361581 Fri, 24 Jun 2022 19:25:35 +0000 steveo 361581@http://citycyclingedinburgh.info/bbpress/ <p>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! </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=20976#post-361578 Fri, 24 Jun 2022 18:04:10 +0000 Yodhrin 361578@http://citycyclingedinburgh.info/bbpress/ <p>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.</p> <p>But that's just me blethering from a position of mostly ignorance so I might be way off :P </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=20976#post-361576 Fri, 24 Jun 2022 17:50:41 +0000 toomanybikes 361576@http://citycyclingedinburgh.info/bbpress/ <p>Suspect weight overblown ( more relevant for buses?). Just that the ratio goes to infinity regardless of numerator when you have no exhaust! </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=20976#post-361575 Fri, 24 Jun 2022 17:46:27 +0000 steveo 361575@http://citycyclingedinburgh.info/bbpress/ <p>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.</p> <p>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. </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=20976#post-361573 Fri, 24 Jun 2022 14:52:33 +0000 toomanybikes 361573@http://citycyclingedinburgh.info/bbpress/ <p>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.</p> <p>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.</p> <p>Will have nightmares about their earlier attempted simplification of medians to say "average median". Ew. </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=20976#post-361571 Fri, 24 Jun 2022 12:08:26 +0000 cb 361571@http://citycyclingedinburgh.info/bbpress/ <p>These claims were somewhat debunked on More or Less:</p> <p><a href="https://www.bbc.co.uk/sounds/play/m0018gql">https://www.bbc.co.uk/sounds/play/m0018gql</a> </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=20976#post-361156 Fri, 03 Jun 2022 16:23:06 +0000 chdot 361156@http://citycyclingedinburgh.info/bbpress/ <p>There’s a surprise </p> <p><a href="https://www.theguardian.com/environment/2022/jun/03/car-tyres-produce-more-particle-pollution-than-exhausts-tests-show" rel="nofollow">https://www.theguardian.com/environment/2022/jun/03/car-tyres-produce-more-particle-pollution-than-exhausts-tests-show</a> </p>