Great to see the city officials in San Francisco and Seattle responding positively to the need for more bike lines.

When two cyclists were tragically killed in hit-and-run accidents this past summer, a group of anonymous urban activists known as the San Francisco Transformation Agency erected a set of protected bike lanes using traffic cones. Usually such guerrilla interventions are temporary. They raise awareness but ultimately get taken down by municipal authorities. But when the same group recently (and illegally) installed a set of soft-hit posts alongside Golden Gate Park, the city reacted by moving to make the change official.

— Guerrilla Bike Lanes: San Francisco Makes Illicit Infrastructure Permanent by Kurt Kohlstedt