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New paper on 20mph! Use of natural experimental studies to evaluate 20mph speed limits in two major UK cities

New paper on 20mph! Use of natural experimental studies to evaluate 20mph speed limits in two major UK cities

New paper from the NIHR funded 20mph project led by Ruth Jepson.

This paper was authored by Karen Milton and Mike Kelly plus members of the 20mph team

Read it in full here –

or get the highlights below!

Innovative study designs, including natural experiments, are important for assessing the impact of ‘real world’ public health interventions. Using multiple methods, this project enabled a deeper understanding of not only the effects of the intervention but the factors that explain how and why the intervention and the effects did or did not occur. Importantly it has shown that 20mph speed limits can lead to reductions in speed, collisions and casualties, and are therefore an effective public health intervention.


• Natural experiments are useful for evaluating real world public health interventions
• This paper presents the methods and findings of two 20mph speed limit interventions
• 20mph limits led to reductions in speed, collisions and casualties in both cities
• 20mph speed limits are an effective public health intervention
• Policymakers should scale up 20mph interventions to improve population health


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