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Re: 20mph is just the start.
Not 30mph down to 20mph but I assume these finding are still relevant.
https://cairntechnology.com/speed-li...l%20pollutants.
A more scientific paper, long winded and also dealing with the effects of various transport/speed options on mental & physical health issues.
https://www.ncbi.nlm.nih.gov/pmc/art...ype%20of%20car).
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"I intend to live forever, or die trying" - Groucho Marx..... "but whilst I do I shall do so disgracefully." Jo Glynne
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