Full list of 20mph roads in Wales that are now 30mph again
There are plenty of roads that have reverted back to 30mph, while decisions on others are still being…
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https://www.newsbeep.com/373036/
20mph zones aren't anti-motorist: they reduce crashes and car insurance premiums.
https://www.theguardian.com/money/2025/jan/18/uk-20mph-speed-limits-car-insurance-costs-premiums
#TwentyIsPlenty #CarInsurance #20mphZones #20mphSpeedLimit #SpeedLimit #InsurancePremiums
Original research: Effect of 20 mph speed limits on traffic injuries in Edinburgh, UK: a natural experiment and modelling study
https://jech.bmj.com/content/78/7/437
Conclusion: Our results indicate that the introduction of 20 mph limits resulted in a reduction in collisions and casualties 3 years post implementation. However, the effect exceeded expectations from changes in speed alone, possibly due to a wider network effect.
Introduction There is limited research evaluating 20 mph speed limit interventions, and long-term assessments are seldom conducted either globally or within the UK. This study evaluated the impact of the phased 20 mph speed limit implementation on road traffic collisions and casualties in the City of Edinburgh, UK over approximately 3 years post implementation. Methods We used four sets of complementary analyses for collision and casualty rates. First, we compared rates for road segments changing to 20 mph against those at 30 mph. Second, we compared rates for the seven implementation zones in the city against paired control zones. Third, we investigated citywide casualty rate trends using generalised additive model. Finally, we used simulation modelling to predict casualty rate changes based on changes in observed speeds. Results We found a 10% (95% CI −19% to 0%) greater reduction in casualties (8% for collisions) for streets that changed to 20 mph compared with those staying at 30 mph. However, the reduction was similar, 8% (95% CI −22% to 5%) for casualties (10% collisions), in streets that were already at 20 mph. In the implementation zones, we found a 20% (95% CI −22% to −8%) citywide reduction in casualties (22% for collisions) compared with control zones; this compared with a predicted 10% (95% CI −18% to −2%) reduction in injuries based on the changes in speed and traffic volume. Citywide casualties dropped 17% (95% CI 13% to 22%) 3 years post implementation, accounting for trend. Conclusion Our results indicate that the introduction of 20 mph limits resulted in a reduction in collisions and casualties 3 years post implementation. However, the effect exceeded expectations from changes in speed alone, possibly due to a wider network effect. Data are available upon reasonable request. Stats19 analysed in this study are available via archive (<https://www.data.gov.uk/dataset/cb7ae6f0-4be6-4935-9277-47e5ce24a11f/road-safety-data>), and aggregated annual data are described in the summary tables in the article or included within the supplementary materials. GIS files are available upon reasonable request.
Romsey Town Council proposing 20mph speed limit across town centre | Hampshire Chronicle
My response: Long overdue.
'Ugly and lurid' road markings appear in town overnight - and locals are fuming - Mirror Online
https://www.mirror.co.uk/news/uk-news/ugly-lurid-road-markings-appear-32135499
Sunak to restrict 20mph zones in attempt to win car drivers’ votes | The Independent
https://www.independent.co.uk/news/uk/home-news/sunak-20mph-speed-limit-car-drivers-b2420581.html
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