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The problem is TfL will not disclose of that figure just how many are actually high polluting vehicles.Most vehicles under 22 years old are very low apart from Diesels which are lower from around 12 years.Well maintained vehicles of that age meet all the regulatory emissions when tested and usually well within the parameters.  They just picked an age category based on Bus and truck Euro 6 parameters. Whereas an MoT readout should be enough to exempt an older vehicle if it meets the low end of the emissions test.Chances are it's a low use vehicle in any case.The whole thing is based on over 80% of vehicles being in daily use meeting that criteria.Except with natural change, that figure has dropped to just 20% and this assumes daily heavy use.So quite how the Toxic air is going to diminish by 80% is incredible. But with all the data banded about coming from funded organisations and no totally independent sources or comparison figures hardly a surprise. It's a claim no-one can actually verify - either way.Fact is they are unable to produce the daily usage figures for restricted vehicles because they do not know ( or want to know) and have never conducted a survey with actual use. It's all been done by modelling with minimal micro surveys. We know from Covid that this can be way off the mark and how necessary more thorough surveying is needed without paymaster interventions.So a significant amount is likely to be older low mileage vehicles with occasional use ( probably shopping trip and long distance occasional trips) and the remainder will be those run by those on low incomes for whom a vehicle is vital to a modest livelihood, and older people who very often use a car for helping others who are mobility restricted.  These people ( both those in need and those who address that need) never get factored in to anything be it LTNs, CPZs, ULEZ and their contribution to ordinary humanitarian life.

Raymond Havelock ● 913d