Staying the obvious here, but it is pretty messed up that there’s no sidewalk on the Somerville side for a big stretch of the Alewife Brook Parkway. Cross safely, kids!!
To be clear, installing a sidewalk here would be millions of dollars in regrading and building a massive retaining wall. Many old-growth trees lost.
I think of that as the opportunity cost of not doing what I think we should do: Reduce Alewife Brook Parkway to three lanes here.