I had the same reaction the first couple times I drove down there, but I've since realized it isn't really any different from a normal curb. It just feels like they narrowed the street. I don't think it'll be a problem for drivers that are "unfamiliar" with Brattle, but they might take some getting used to for folks that drive in the area regularly and aren't paying attention. I'd rather see those drivers plow into a concrete curb than take out a cyclist.