evidence: The "15-minute city" is an approach to urban design that aims to improve quality of life by creating cities where everything a resident needs can be reached within 15 minutes by foot, bike or public transit. [...] While 15-minute-cities appear to be a fairly innocuous urban planning strategy to most, they have attracted significant ire from some corners of political life. In fact, the idea has found its way neatly into an existing web of conspiracy theories. [...] "I am calling time on the misuse of so-called 15-minute cities", Harper told conference. "There’s nothing wrong with making sure people can walk or cycle to the shops or school. That’s traditional town planning.