More Bike Lanes and Trees Make Greener Cities
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.
Today there is growing support for bicycling in many U.S. cities for both commuting and recreation. Research is also showing that urban trees provide many benefits, from absorbing air pollutants to cooling neighborhoods. As an academic who has focused on the bicycle for 37 years, I am interested in helping planners integrate cycle tracks and trees into busy streets.
Street design in the United States has been guided for decades by the American Association of State Highway and Transportation Officials, whose guidelines for developing bicycle facilities long excluded cycle tracks. Now the National Association of City Transportation Officials, the Federal Highway Administration and the American Association of State Highway and Transportation Officials have produced guidelines that support cycle tracks. But even these updated references do not specify how and where to plant trees in relation to cycle tracks and sidewalks.
Read more at CityLab.com.