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Old 03-19-2014, 06:17 PM
7,281 posts, read 8,878,707 times
Reputation: 11419


Did the car banning solution they used work before?

The answer is no, it was a temporary fix until the "crisis" was over and then it was back to the usual.

People do not change their driving habits because of temporary requirements, they find ways around the requirements. This has been proven time and time again, speed limits being one perfect example. The majority of people in many places drive above the speed limits when the speed limits are temporary. Even in places where the limits are in place for long periods of time as in permanent for practical purposes, people speed.

Speeding causes more pollution because more fuel is expended to travel the same distance than when driving slower (almost always).

The solution is a social change, not banning some cars on one day and others the next. It isn't electric cars either although they can contribute to a greater solution.

More can be done to solve the air pollution problems from vehicles by reducing the requirement to travel than by figuring out a way to leave everything as is and develop new cars. At some point, the manufacturing of anything creates a lot of waste if the manufacturing is on the scales that in the case of electric cars, make a significant difference in air quality. Avoiding the manufacturing in the first place reduces that manufacturing waste.
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Old 03-19-2014, 11:57 PM
Location: Volcano
12,971 posts, read 23,628,346 times
Reputation: 10580
Originally Posted by Dakster View Post
You can retrofit diesel cars with DPF's which traps soot and particulate. Although it may be cost prohibitive.
From what I've read, add-on DPFs (Diesel Particulate Filter) were never required on older vehicles, but still had some popularity when new standards were imposed in 2005, not so much in 2011, and now seem unlikely to be able to even meet 2015 EU6 standards, because of reduced permissable NOX levels, requiring more fundamental engineering to the engine to achieve. Fortunately for owners of older cars, they are grandfathered in, and only new registrations have to meet the new rules.

Last year about 1% of the new automobiles sold in the US were diesel, while in France 76% were. Why the huge difference? It seems that differences in government policy are the primary cause. A key factor is that in the US diesel fuel is taxed in such a way that it is more expensive than gasoline, whereas in France gasoline is about $7 a gallon, while diesel is about $6. The effect of this fuel price differential is that even though diesel cars are more expensive to buy, the increase gets paid back in a couple of years, after which the diesel is less expensive to use in France. So it's more popular, and therefore French auto makers focus on manufacturing diesels, etc.

And all of this traces back to the French government deciding on a strategy years ago to reduce dependence on foreign oil imports by encouraging the use of the more fuel efficient diesels. Other European countries have a much more balanced policy, and hence a more equal distribution of gas and diesel cars.
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Old 03-20-2014, 07:08 AM
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Good news that DPF's are not required on older vehicles, but it is something that can be done if it was needed to be done. If that makes sense.

So in France it could be around 50% less to drive a diesel than a gas. First the 15% savings in fuel price and then diesels get 25% - 40% better mileage.

So even the SCR's that are on US Diesel vehicles do not meet 2015 EU standards? I'll be looking that up as I am curious now. I use a gallon of DEF (Diesel Exhaust Fluid) every 800 or so miles so that the vehicle doesn't put out a lot of NOX. And it has a very aggressive EGR strategy, which I am not trilled about as that is common failure point, but I'd rather have clean air.
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Old 03-20-2014, 12:39 PM
Location: Oakland, CA
27,171 posts, read 29,681,041 times
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How fun, the French elected officials are biking to their meetings too!
Cyclelicious » Christiane Taubira commutes by bike
Cyclelicious » French cabinet minister Aurélie Filippetti bikes to work
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