London 2007.

Methods	CBA I) 5 yrs before data 1‐5 yrs after data C) 5 yrs before data 3 yrs after data
Participants	I) 78 20 mph zones in London C) All unclassified roads in London
Interventions	I) Area‐wide traffic calming including road humps, raised junctions, speed cushions, chicanes, and raised footways. C) No area‐wide traffic calming.
Outcomes	Road traffic crash related injuries, deaths and serious injuries, and injuries to pedestrians, cyclists, powered 2‐wheeler riders, and car occupants. All road traffic crashes and crashes involving a death or serious injury. Road traffic crash related injuries to children.
Notes	Collision data collected from police records.