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If you're doing this to offset damage done to the roads, something to keep in mind is that passenger cars are totally irrelevant in terms of road damage compare

by ericd 2y ago

If you're doing this to offset damage done to the roads, something to keep in mind is that passenger cars are totally irrelevant in terms of road damage compared to large trucks, because road damage is a function of the fourth power of axle weight ( https://en.wikipedia.org/wiki/Fourth_power_law https://en.wikipedia.org/wiki/Fourth_power_law ).

_djo_ 2y ago
That may be true, but heavy goods vehicles are already taxed in the UK according to a sliding scale of their mass and number of axles in order to account for their damage to roads. [0] [0] https://assets.publishing.service.gov.uk/media/64ca1f035c2e6f0013e8d967/v149x1-rates-of-vehicle-tax.pdf https://assets.publishing.service.gov.uk/media/64ca1f035c2e6...
- ericd 2y ago
  Nice. Those amounts seem kind of low, though? Not sure if I'm reading it correctly. A truck that weighs 20x the amount of a passenger car, with 2 axles, appears to pay 300 pounds per year? Also, weirdly, a 40,000 kg truck with 2 axles seems to be taxed less than the same truck with 4 or more axles.
  - _djo_ 2y ago
    These are annual registration taxes, not usage taxes. Ideally you'd want a sort of usage tax also based on this, but implementation has been difficult to achieve. [0] [0] https://www.lafabriquedelacite.com/en/solutions/weight-tax-and-taxes-on-hgv-traffic-in-europe/ https://www.lafabriquedelacite.com/en/solutions/weight-tax-a...
    - ericd 2y ago
      Yeah, a fixed tax, but based on weight, which is sort of a low-resolution usage tax. 300 pounds is more, but not very significantly more, than car registration in many US states.
  - unclenoriega 2y ago
    Perhaps more points of contact is better for the road?
    - ericd 2y ago
      Yeah, it should be, but it seems they're taxing more axles more for the same weight, so it seems like something else is going on there.
- BoiledCabbage 2y ago
  Yes, but I think OPs point is if you're taxing vehicles according to their contribution to road damage, then cars should efficiently be taxed at 0 (I don't know I'd that is true, but it seems to be the point their making). If heavy goods are 100% of the damage, they should cover 100% of the tax. Now that said, I'm not convinced they are actually 100% of the damage. I've seen many residential streets in need of repair that essentially never see heavy vehicle traffic. And I'm also not certain that taxes should be based on cost added vs value provided - but it's a reasonable discussion to have. But again this seems short sighted. Electric vehicles (vs ICE) remove a ton of negative externalities from society. And while they do bring others (in how many of their materials are sourced) they are a big net positive. Don't disincentivise them because of a change in fuel tax revenue.
  - ericd 2y ago
    Yeah, weather/time do a lot, it's definitely not all trucks. And a lot of them are maintained just so they're available for everyone, whether they're being heavily used or not. So I don't actually think that trucks should bear everything. But I do think they should pay a large fraction of highway maintenance budgets, partly so that they're not unfairly advantaged versus cargo rail. Mostly putting it out there so that people don't start thinking that EVs need to be taxed more highly than ICE cars because they're a bit heavier.
  - Chris2048 2y ago
    > I've seen many residential streets in need of repair that essentially never see heavy vehicle traffic Maybe just the freeze-thaw cycle?
eesmith 2y ago
That fourth-power is more complicated then your summary suggests. For example, it's also a function of road design, which is why a high-speed limited access road is able to handle significantly higher loads than a suburban cul-de-sac. Consider that a bus weighs a lot more than a car, so a simple 4th power analysis suggests it will cause several orders of more damage than if everyone drove their own car. However, busses tend to run on bigger roads which are better designed to handle the weight (with the expectation that people will walk a few blocks to get to the stop), rather than residential streets which are mostly designed for private vehicles and the occasional delivery truck/van. On those roads, heavy passenger cars are relevant to road damage.
- ericd 2y ago
  Ah, good point, thanks!
deleted 2y ago
[deleted]

by ericd 2y ago

_djo_ 2y ago

That may be true, but heavy goods vehicles are already taxed in the UK according to a sliding scale of their mass and number of axles in order to account for their damage to roads. [0] [0] https://assets.publishing.service.gov.uk/media/64ca1f035c2e6f0013e8d967/v149x1-rates-of-vehicle-tax.pdf https://assets.publishing.service.gov.uk/media/64ca1f035c2e6...

ericd 2y ago
Nice. Those amounts seem kind of low, though? Not sure if I'm reading it correctly. A truck that weighs 20x the amount of a passenger car, with 2 axles, appears to pay 300 pounds per year? Also, weirdly, a 40,000 kg truck with 2 axles seems to be taxed less than the same truck with 4 or more axles.
- _djo_ 2y ago
  These are annual registration taxes, not usage taxes. Ideally you'd want a sort of usage tax also based on this, but implementation has been difficult to achieve. [0] [0] https://www.lafabriquedelacite.com/en/solutions/weight-tax-and-taxes-on-hgv-traffic-in-europe/ https://www.lafabriquedelacite.com/en/solutions/weight-tax-a...
  - ericd 2y ago
    Yeah, a fixed tax, but based on weight, which is sort of a low-resolution usage tax. 300 pounds is more, but not very significantly more, than car registration in many US states.
- unclenoriega 2y ago
  Perhaps more points of contact is better for the road?
  - ericd 2y ago
    Yeah, it should be, but it seems they're taxing more axles more for the same weight, so it seems like something else is going on there.
BoiledCabbage 2y ago
Yes, but I think OPs point is if you're taxing vehicles according to their contribution to road damage, then cars should efficiently be taxed at 0 (I don't know I'd that is true, but it seems to be the point their making). If heavy goods are 100% of the damage, they should cover 100% of the tax. Now that said, I'm not convinced they are actually 100% of the damage. I've seen many residential streets in need of repair that essentially never see heavy vehicle traffic. And I'm also not certain that taxes should be based on cost added vs value provided - but it's a reasonable discussion to have. But again this seems short sighted. Electric vehicles (vs ICE) remove a ton of negative externalities from society. And while they do bring others (in how many of their materials are sourced) they are a big net positive. Don't disincentivise them because of a change in fuel tax revenue.
- ericd 2y ago
  Yeah, weather/time do a lot, it's definitely not all trucks. And a lot of them are maintained just so they're available for everyone, whether they're being heavily used or not. So I don't actually think that trucks should bear everything. But I do think they should pay a large fraction of highway maintenance budgets, partly so that they're not unfairly advantaged versus cargo rail. Mostly putting it out there so that people don't start thinking that EVs need to be taxed more highly than ICE cars because they're a bit heavier.
- Chris2048 2y ago
  > I've seen many residential streets in need of repair that essentially never see heavy vehicle traffic Maybe just the freeze-thaw cycle?

eesmith 2y ago

That fourth-power is more complicated then your summary suggests. For example, it's also a function of road design, which is why a high-speed limited access road is able to handle significantly higher loads than a suburban cul-de-sac. Consider that a bus weighs a lot more than a car, so a simple 4th power analysis suggests it will cause several orders of more damage than if everyone drove their own car. However, busses tend to run on bigger roads which are better designed to handle the weight (with the expectation that people will walk a few blocks to get to the stop), rather than residential streets which are mostly designed for private vehicles and the occasional delivery truck/van. On those roads, heavy passenger cars are relevant to road damage.

ericd 2y ago
Ah, good point, thanks!

deleted 2y ago

[deleted]