Low Traffic Neighbourhoods, or LTNs, reduce traffic in residential streets, and improve access for pedestrians and cyclists with dedicated lanes, wider pavements and planters blocking off vehicle access.
Speed limits of 20mph are designed to reduce the severity of injuries suffered in accidents.
Not to mention that 15 minute cities are pretty great!
Because of the way the one way systems are here, anything inside a 15 minute walk is already faster to walk to than drive to, and it works well.