If anyone really cared they would have taken the emissions far beyond the individual vehicles. By that I mean, and I forget the exact percentage, but far from half of the emissions emmitted by vehicles is when they are sitting in traffic at an idle. Now, if true emission reduction was the issue, why not take care of it all at once instead if phasing things in year after year, after year based on engine size, etc, etc. Why not make a system similar to what is already in use for storm and waste water? In other words at intersections where most emissions occur, on interstates where traffic jams occur, why not install vacuum/suction grates that draw in the emissions from ALL vehicles and carries it to a centralized point for cleaning? Granted a project like that would probably cost billions, and take years to impliment, but in the end ALL vehicles would be taken care of. As it stands how many billions have already been spent, how many billions are continuing to be spent trying to keep individual vehicles in compliance, and how many more billions are being spent by mfgs (and the consumer to help cover those costs) in R$D work to keep up with the latest EPA demands? Another benefit to this design would be that as technology advanced the central 'processing plants' could be retrofitted to clean ALL of the air better, and cheaper, than trying to upgrade technology on millions of old vehicles. Too there would be billions more saved by the mfgs not having to constantly change their design every year to meet the latest EPA regs. Instead that money could be spent actually making the vehicles safer vs trying to make them lighter in weight, etc, etc so they can use smaller engines to help meet the EPA's demands.
For those that read this and say it can't be done, think about it this way. What's more important, carrying storm water for miles and miles inside of a pipe, something civilized man has been doing for years, to insure it dumps where we want it to, or keeping our air clean? It's one of those things that CAN be done, but will probably never get done because it actually makes sense to do it......
In the end everyone would benefit financially from doing it this way, and we'd all be breathing cleaner air too.
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