dcfcsteve:
I would imagine that environmental impact is only one of the reasons people have a dislike for the amount of 4x4's on the road. Certainly for me, it's a pretty small reason given the facts you outlined above. However, it is my opinion that the presence of so many of them on today's roads is going to lead to significant problems. Here are some reason i don't like them.
Like I mentioned, albeit in a slightly derogatory way, the use of them by parents for unnecessary trips over very short distances is quite evident every schoolday morning and evening. Every morning i have to endure painstakingly slow manoevres carried out by men and woman grappling with steering wheels, reversing forwards and backwards on fifty point turns trying their best not to hit any of the tiny kids with their monstrous tanks. It's pathetic. On any school holiday, the same journey is a joy to drive given the absence of said 4x4's.
It is well known that many people (women in particular) find that 4x4's/SUV's/etc afford them a more authoritive position on the road. This being a reason for using them is an example of their potential danger.
Fair enough they don't consume fuel at the same rate as high capacity sports cars or luxury cars. However, as you say, there are far more of them around. Now it is the case that most of the 4x4's are diesel engined. Diesel engines produce much larger quantities of PM10's (particular matter less than 10 microns in diameter - highly damaging to human respiratory systems) which is cannot be removed by catalytic converters (in fact, cc's actually are responsible for more of these being produced by engine emissions). The increased presence of 4x4's, trucks, vans, etc on urban streets/roads mean that the contribution to air pollution in these areas is made up for the most part by these vehicles.
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