Evaluating the citywide Edinburgh 20mph speed limit intervention effects on traffic speed and volume: A pre-post observational evaluation.

PLoS One · 2021 · PMC8719778 · PMID 34972123

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an overall trendno p-value reported

This present study does not provide definitive information to explain “how” 20mph speed limits lead to a reduction in average speeds and an overall trend for reduction across the speed distribution.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.