See also perhaps "Effect of reducing the posted speed limit to 30 km per hour on pedestrian motor vehicle collisions in Toronto, Canada - a quasi experimental,

See also perhaps "Effect of reducing the posted speed limit to 30 km per hour on pedestrian motor vehicle collisions in Toronto, Canada - a quasi experimental, pre-post study" * https://bmcpublichealth.biomedcentral.com/articles/10.1186/s12889-019-8139-5 https://bmcpublichealth.biomedcentral.com/articles/10.1186/s...