Some actual studies. Edinburgh: https://www.edinburgh.gov.uk/downloads/file/32217/evaluation-of-the-20mph-speed-limit-roll-out-three-years-post-implementation h

Some actual studies. Edinburgh: https://www.edinburgh.gov.uk/downloads/file/32217/evaluation-of-the-20mph-speed-limit-roll-out-three-years-post-implementation https://www.edinburgh.gov.uk/downloads/file/32217/evaluation... Belfast: https://jech.bmj.com/content/77/1/17 https://jech.bmj.com/content/77/1/17 Traffic volume is reduced with more people choosing walking and cycling. Speeds are reduced only a little (you weren't going as quickly as you thought anyway) but potentially reducing accidents. The Edinburgh data shows a dramatic reduction in accidents, down almost a third.