Flutterby™! : Implementing 20MPH speed limits

Developing and implementing 20-mph speed limits in Edinburgh and Belfast: mixed-methods study

Results: Collisions and casualties – the overall percentage reduction in casualty rates was 39% (the overall percentage reduction in collision rates was 40%) in Edinburgh. The percentage reduction for each level of severity was 23% for fatal casualties, 33% for serious casualties and 37% for minor casualties. In Belfast there was a 2% reduction in casualties, reflecting differences in the size, reach and implementation of the two schemes. Perceptions – in Edinburgh there was an increase in two factors (support for 20 mph and rule-following after implementation) supported by the qualitative data. Liveability – for both cities, there was a small statistical increase in liveability. Speed – mean and median speeds reduced by 1.34 mph and 0.47 mph, respectively, at 12 months in Edinburgh, with no statistically significant changes in Belfast. History, political context, local policy goals, local priorities and leadership influenced decision-making and implementation in the two cities.

DOI: 10.3310/XAZI9445

Via https://mobile.twitter.com/War...Wells/status/1579114657495027713

Also https://mobile.twitter.com/War...Wells/status/1576890281827348480 which linked to Slowing city traffic cut road deaths by a quarter

Restricting a city’s speed limits to 20mph reduced road deaths by almost a quarter and serious injuries by a third, research reveals.