Double parking tickets are cheaper than hydrant tickets, so every person who feels like stopping for a while at Inman just double-parks, blocking one side of the road. Of course, tickets don't get issued, so people feel free to do it all the time.
Ignoring the safety problems of the reduced visibility and trying to navigate around cars and avoid pedestrians crossing between cars and so on, it causes knock-on traffic problems for the rest of the city.
During the afternoon and evening, this really slows down traffic, except when a truck unloads across from a double-parked car. Then Beacon St stops when people block intersections, and Hampshire, and Prospect, and Broadway... And so on. I've been stuck in hour-long gridlock in that area.
Parking is, admittedly, at a premium at Inman square, but can we at least have some enforcement from the police who stop there or drive by, so that it might be a little bit more under control?