Without question, street trees fundamentally improve the pedestrian experience along city streets. Their canopies provide shade and shelter from the wind and rain, but they take up a small amount of valuable street space. This space is almost always taken from the sidewalk. Pedestrians can maneuver around tree trunks better than cars, so this makes some sense.
But cities around the world (the Streetfilms piece is about Melbourne, Australia) and those close to home are trying something that might be a lot better, at least along streets with narrow sidewalks.
Those cities are taking the space occupied by a few parking spaces along a given block and planting trees in the parking lane:

Pacific Avenue in Santa Cruz
University Avenue in BerkeleyThe obstacle to doing this in SF is the omnipresent opposition to removing any parking spaces. The few spaces 'lost' to new street trees, however, could easily be replaced in some situations by adding spaces on side streets or removing curb cuts to inactive garages.
The benefits are functionally wider sidewalks, less root damage to brittle concrete, and more space for the trees' canopies away from buildings. My question is, given the benefits this option affords, why wasn't it considered as part of the Cesar Chavez redesign project?
The benefits are functionally wider sidewalks, less root damage to brittle concrete, and more space for the trees' canopies away from buildings. My question is, given the benefits this option affords, why wasn't it considered as part of the Cesar Chavez redesign project?

