Looks decent enough. I know Oxford (and I believe Harvard as well) St used to be a designated bike route until the City of Cambridge declared that all streets must be bike-friendly and removed all bike route signs. Of course the difference between declaration and accomplishment makes that a briandead move, but whatever. I believe that the pavement has been allowed to degrade substantially as a result of its de-annointing, though.

I would steer clear of the cycle track on Vassar St as the on-sidewalk sections and the irregular interaction with street traffic make it a real hazard. Better to stay in the street and of course clear of the door zone, as it is with all of Cambridge's door zone bike lanes.

One other thing to watch for is the eventual extension of the Somerville Community Path from Cedar St all the way down to the Northpoint development near Lechmere. While it's still a ways off, funding and right-of-way have been secured. I don't know if you'll still be hauling your son around at that point or not.

Take a look at a Rubel's Boston Bike Map if you haven't already. That's always helpful. Also, if you want, shoot Greg Palmer of the Somerville Bicycle Committee a note. He's a nice guy and a dedicated transportational cyclist. walker2468@earthlink.net