ELI5: Explain Like I'm 5

Tactical urbanism

Tactical urbanism is about using small, low-cost changes to a city, like adding a bike lane or a park, to improve the quality of life for everyone who lives there. It is a way of testing out ideas and making sure they work before investing a lot of money in a bigger project. That way you can have a better idea of what people want and what works in the city. It is like a city-scale science experiment where people can try out ideas on a small scale.
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