Laurel Wamsley

There's a new term that has become popular in city planning circles: tactical urbanism. The idea is that small experiments, done cheaply and quickly, can make cities better, and more nimble.

Some of the tactics are guerrilla methods: citizens might paint a crosswalk where they believe one should exist, or post their own road signs where they find the official ones confusing.

Across the country, DIY urbanists have been leaving their mark on cities — and now city governments are trying to bring them into the fold to harness their ideas.

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