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Road Tolls 2018
Road damage is 4th power of axle loading. A 1000kg car causes 100 000 times as much damage as a 10kg primary vehicle. If primary vehicle users pay 1p per mile, moronists must pay £10 per mile. Sounds fair to me. |
#2
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Road Tolls 2018
On Fri, 29 Dec 2017 13:56:23 -0800 (PST)
Simon Jester wrote: Road damage is 4th power of axle loading. A 1000kg car causes 100 000 times as much damage as a 10kg primary vehicle. If primary vehicle users pay 1p per mile, moronists must pay £10 per mile. Sounds fair to me. ITYF it's gross axle weight that matters. I'm not sure how the calculation varies with pressure at the road surface - me on a bike with 20mm tyres at 140PSI probably exerts a higher pressure than a small car. Of course it seems the calculation ignores the existence of single track vehicles anyway, otherwise they'd be considering wheel loading rather than axle loading. I'm pretty sure that they should be considering pressure along with weight though - a LGP vehicle can do less damage to delicate heathland than an inconsiderately ridden mountain bike, and I imagine that similarly applies to road structures. |
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Road Tolls 2018
On Saturday, December 30, 2017 at 9:51:11 AM UTC, Rob Morley wrote:
On Fri, 29 Dec 2017 13:56:23 -0800 (PST) Simon Jester wrote: Road damage is 4th power of axle loading. A 1000kg car causes 100 000 times as much damage as a 10kg primary vehicle. If primary vehicle users pay 1p per mile, moronists must pay £10 per mile. Sounds fair to me. ITYF it's gross axle weight that matters. I'm not sure how the calculation varies with pressure at the road surface - me on a bike with 20mm tyres at 140PSI probably exerts a higher pressure than a small car. Of course it seems the calculation ignores the existence of single track vehicles anyway, otherwise they'd be considering wheel loading rather than axle loading. I'm pretty sure that they should be considering pressure along with weight though - a LGP vehicle can do less damage to delicate heathland than an inconsiderately ridden mountain bike, and I imagine that similarly applies to road structures. http://www.nvfnorden.org/lisalib/get...spx?itemid=601 |
#4
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Road Tolls 2018
On 30/12/17 09:51, Rob Morley wrote:
On Fri, 29 Dec 2017 13:56:23 -0800 (PST) Simon Jester wrote: Road damage is 4th power of axle loading. A 1000kg car causes 100 000 times as much damage as a 10kg primary vehicle. If primary vehicle users pay 1p per mile, moronists must pay £10 per mile. Sounds fair to me. ITYF it's gross axle weight that matters. I'm not sure how the calculation varies with pressure at the road surface - me on a bike with 20mm tyres at 140PSI probably exerts a higher pressure than a small car. Of course it seems the calculation ignores the existence of single track vehicles anyway, otherwise they'd be considering wheel loading rather than axle loading. I'm pretty sure that they should be considering pressure along with weight though - It's not a matter of considering bicycles and motor vehicles as objects delicately placed on the road surface and then left alone - tyre pressures are utterly insignificant compared to the static load bearing capacity of road materials. Vehicles are moving along, producing cyclic effects deep under the surface and it is this that really matters. From observation, I suggest the road surface (I assume we are talking about the finishing layer of gravel bound by tarmac or asphalt) usually only seems to fail when it becomes unstuck or the structure underneath has failed; it also seems to me that surface erosion is mostly due to tyre scrub. a LGP vehicle can do less damage to delicate heathland than an inconsiderately ridden mountain bike, and I imagine that similarly applies to road structures. Depends on whether the damage you are considering is just visual damage, at the surface, or down amongst the roots. On a muddy track, it is usual for a motor vehicle to produce deeper/wider ruts than a mountain bike. On a dry, dusty track, it is usual for a motor vehicle to throw up bigger clouds of dust than a bike (with any kind of tyre). |
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