Designing greener streets starts with finding room for bicycles and trees

City streets and sidewalks in the United States have been engineered for decades to keep vehicle occupants and pedestrians safe. If streets include trees at all, they might be planted in small sidewalk pits, where, if constrained and with little water, they live only three to 10 years on average. Until recently, U.S. streets have also lacked cycle tracks – paths exclusively for bicycles between the road and the sidewalk, protected from cars by some type of barrier.

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