The report produced an extensive list of equations for describing the data collected from the tests, and from those equations was born the Generalized Fourth Power Law. It’s a rule of thumb for comparing the amount of pavement damage caused by vehicles with different weights, in terms of axle loads:
(W1/W2)^4
In the equation, W1 is the weight of an axle on vehicle 1, which we would compare to W2, the weight of an axle on vehicle 2.
Let’s look at some numbers for comparison.
Consider a standard sedan with two axles and a total weight of 2 tons. Assuming an even distribution, each of its axles would bear the weight of 1 ton. Now consider a semitruck with eight axles and a weight of 40 tons -- each of its axles would weigh 5 tons. The relative damage done by each axle of the truck can be calculated with the following equation, and comes out to 625 times the damage done by each axel of the sedan.
(5 tons/1 ton)^4 = 625
Considering that the truck has eight axles and the sedan has two, the relative damage caused by the entire semitruck would be 625 x (8/2) -- 2,500 times that of the sedan.
- https://www.insidescience.org/news/how-much-damage-do-heavy-... - https://urbanmilwaukee.com/2017/06/22/murphys-law-how-trucks... - https://truecostblog.com/2009/06/02/the-hidden-trucking-indu...
Equating the marginal increase in pavement maintenance costs (due to trucks and heavy-loads) to the overall costs of building and operating a highway is also entirely wrong, but that's a bit tangent the point here.
I'm usually the first to point out the outsized amount of damage and wear attributable to heavy vehicles, but it's still a marginal increase of only one cost component in running a public transportation network.
That changed when I traded-in my Tesla for a mid-sized, off-road capable truck, and found myself on the receiving end of this view.
I certainly did not buy a truck to "overcompensate" as the article suggests or to use it only to haul groceries. I'm not even a blue collar worker – decidedly white collar in SV, with no need to haul lumber or construction material. Luckily, being a SV white collar type also made me beneficiary of WFH, and killed my commute.
I loved my model S, but didn't need an efficient/fun tarmac shuttlecock between work and home anymore. I also found that an off-road truck was more suited to my new "commute": like the ability to go haul my astrophotography equipment to the middle of nowhere – far away from light pollution where regular cars can't make it.
I also traded-in my road bike for a mountain bike because I discovered that even small/mid-sized cars are hostile to cyclists in America. It doesn't matter if a Nissan Leaf runs me over or a Ford F-150 – I'm still dead. So now I also use my off-road truck to haul my off-road bike to places where a regular car can't run me over. A bear maybe, but not a car.
Rivian seems to offer the best of all worlds, and I'm rooting for their charging infrastructure to grow asap – so I can still do truck stuff, without the emissions.
Are there people who'll buy a truck/SUV only to use it as a mall crawler? Sure. Just as there are people who'll buy BMW M3s or Porsche 911s and never take it on the track.
a large amount of garden soil
a Christmas tree
a large sofa
an ATV
a camper attachment
a cage containing 2 live goats
leaf debris from a half acre of lawn
playground equipment
(Results may vary, such as with an exceptionally large car trunk)
At this point, there's a lot of engine tech that really helps to optimize for a vehicle's power demands. Ford in particular is running very small volume engines at high compression ratios to get some great fuel economy.
Current safety ratings are only for people inside of the vehicle and that is insane.
As a family person that runs to fruit market every several weeks and brings back a boot load of fruits in boxes it is hard to understand how a sedan can suffice.
Having said that huge SUVs are overkill too, something like Subaru Forester/Outback or RAV-4 seems to be the sweet spot for people with less than 3 children. With 3 children you start looking at something with 3rd row of seats.
Hard to believe that the 100 gallon boot volumes of a small sedan are insufficient for a weekly fruit&veg shop - let alone the 300 gallon boot of an estate car or the 400 gallon boot that a compact car has if you take the 30 seconds to lay down the rear seats before you load it...
And being a bit older, I do remember being driven into summer holidays with a family with 3 children, luggage and an inflatable rubber boat - in a Fiat 126 (half the length, half the width, and a quarter of the weight of today's giant pick-ups and Escalades...
That's boot of my Subi Forester and that is not the fullest it is ever been. During mango season we even take a bit of passenger space. That box of oranges is was 5 AUDs btw.
Practice is often different from theory.
Now having written that and looking at you user handle I realise that you might think that mangoes are firm and you can stack it.
Well, those firm mangoes you see in super markets are not ripe, they are green. Ripe mangoes we buy here in Australia are soft, you can damage them with you fingers and I would like to keep them for at least couple weeks.
It can be done, and it is done all the time all around the world. People just want to use their extreme case to justify both ways. We are saying “I fit my whole house in a fiat 500” and they are saying “I eat for 25 people every week so others must need it to”.
The reality is that people drive suburbans and Tahoes and they don’t even have kids just because they can. I hate to say it but the best thing that can happen to the US culture is expensive fuel. And I say this as someone who races cars as a hobby and would like cheap fuel.
I agree with everything you wrote in this paragraph in terms of SUV vs. compact hatchbacks, but I stand by the fact that if all large crossovers and small SUVs were replaced by midsized station-wagons the roads would be a better place and the drivers would lose no utility.
I remember laughing my head off when Lexus announced they were making a "Luxury SUV". I'm on my second one and it rarely even experiences a gravel road.
Taking a new and expensive 4WD down a narrow track with branches scraping stripes down the side would be too stressful for most.
Because it is hard to prove to others, and especially to yourself, that your life is quite good. You can buy expensive clothes (with huge logos that can be seen from a mile) but how expensive can they get, they can be fakes; you can have expensive house (but not much people can see you comong in/out), etc.
So car becomes a perfect proof. "Everybody sees how big and how new and how powerful and loud it is". You have succeeded. Look at drivers sometimes. They are even acting like driving in a movie of some sort. Doing faces when accelerating and etc.
It is the same with plastic surgery - you don't want it to be subtle anymore. You want it to be visible. So anybody can know that you can afford it.
Trucks and SUVs make for great family movers.
I have a full sized half ton truck, It is the main family hauler. But I use the bed alot and tow my boat or trailer all the time.
But something small like a Ford Escape is perfect for most, and that is why there are so many of these compact crossovers on the road. They are bigger than a Car, higher up, and the back seats can be fold down to allow for a lot of storage room. Our secondary Vehicle is a Escape titanium, and see these everywhere along with Rav4's and CRVs. Really the only 3 compact crossovers worth looking at IMO.
https://academic.oup.com/jpubhealth/article/33/2/160/1591440
In this sense an SUV is like smoking lots of cigarettes around others but without inhaling as much.
Another argument for universal, free at point of use, health care?
The best selling trucks in America, the F150 and the Chevy Silverado, are lighter than a Tesla S.
Trucks are such horrible deadly things for cities and should be either banned or prohibitively taxed for anyone who doesn't need them.
https://insidescience.org/index.php/news/how-much-damage-do-...
https://www.thedrive.com/news/26907/you-dont-need-a-full-siz...
Even so, the goal here is to spend the resources to permit movement of goods and people... not to limit traffic to those vehicle types that do the least damage to the road. The road is there to be used, not admired.
If you really want 0 damage, work toward legalizing hovercraft on national highways.
Why on earth do you think it's ok to compare the damage done by industrial freight vehicles to personal transportation?
Regenerative braking helps reduce the extra energy cost of this quite a bit by recycling a decent percentage of the kinetic energy you put into moving that big heavy thing.
The weight does have some safety and handling benefits under some conditions but it does probably do more road damage.
As EVs grow states will probably have to charge a “road fee” or something, but it will still be far less costly than gasoline fuel and all the extra maintenance an ICE requires.
Rednecks will stop scoffing at EVs once they find out what instant full torque means. Days worth of on site power for job sites or camping without generator noise is also pretty badass.
If you’ve been able to beat that, then you are better at this than I am.
Absolutely disheartening to see EVs amenable to people who drive trucks and SUVs though, one would hope their manly culture of overpaying for patriotic vehicles would change before the climate does, but alas.
The average price of a pickup truck sold today is $56K, very far from the "blue collar workhorse" it is advertised as. 70%+ of them will never see a day of off-road or hauling use (https://www.thedrive.com/news/26907/you-dont-need-a-full-siz...).
Aside from the safety problems (for pedestrians & cyclists, not the driver of course), these trucks also wreck city streets, which are not designed for them. It's disappointing that this trend is continuing with EVs as well.