Generally people driving old bangers do so because that is what they can afford. You can't tax these people more for only being able to afford an old car, that is inherently wrong and would be political suicide for any party that chooses to go that route.
I was behind a 2015 Focus the other day spewing **** out of the exhaust. I'd wager that a well maintained Peugeot 1.9 TD would have less environmental impact that that particular POS.
Not always. The multi-millionaire owner of a company I used to work for drove around in an old Focus. Because he was quite tight, didn't see the need for anything more and didn't want to worry about parking it in town.
Usually if there is a trail of smoke coming out of an exhaust it's on it's last legs anyway. Old diesels should only smoke a bit on cold start or when you floor it. Mine doesn't smoke once warm despite being to old for a DPF. Like I mentioned earlier though it seemed to get worse after biodiesel appeared at pumps.
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