Cambridge also seems to have a disproportionate number of unsafe bicyclists (and pedestrians) for some reason. Maybe it's all the students. It's probably a net good thing that cycling lanes are being improved although there are certainly tradeoffs given the traffic and parking situation. However, whenever I'm driving home up Beacon Street after dark, there are invariably cyclists zipping around with no lights, going up streets the wrong way, and pedestrians dressed in dark colors randomly quickly stepping out from behind parked cars into the street.

The bike lanes that now exist probably make things safer overall but there's a lot of dangerous behavior out there on the part of many types of infrastructure users (including cars as well).