The various initiatives — known as Tempo 30 in German-speaking countries, City 30 across Europe, Love30 by the WHO and 20’s Plenty in the UK and the US, the latter referring to miles per hour — have been gaining steam in recent years. Paris and Brussels introduced a default speed limit of 30 kilometers per hour in 2021, Lyons in 2022 and Bologna in early 2024, with Milan and Parma planning to follow suit this year. Beyond the EU, Wales introduced a 20 mph limit as the default for all residential roads in September 2023, and a couple of US cities, like Portland, have begun reducing their residential speed limit to 20 mph.