^I'm assuming the one at Blue Hills, but Both could use some work. the Route 24 exit is bad and could use some reworking as well.
Ron, I don't disagree with your sentiment, but this project isn't to improve or increase capacity and encourage more motorists, it's to increase safety. It's a dangerous road, and improvements are necessary in this particular situation. 95/128 is a suburban highway, it's a major thoroughfare for people heading everywhere from Canada, Maine, and New Hampshire all the way down to Miami.
If rush hour breakdown lane travel were allowed on 93 and they planned on widening to improve safety, my feelings would be different. I'd say just eliminate breakdown lane travel, and let the congestion build-- hopefully some of those people would consider alternate routes. But that's not the case for 128, it's a major roadway meant to be used by people traveling long distances as well as regular local commuters and the safety concerns warrant this project.
Who knows, if it's successful, it may even alleviate a little traffic from 93. I personally use 93, even in rush hour, to travel from south of Boston to the north simply because I can't stand driving on 128. I know lots of people who do the same. If it were easier and safer to use 128, maybe it'll take some cars out of the city and force them around it (just a though, nothing other than personal tastes of myself, friends, and family to back it up).
*edit* didn't realize they meant the interchange in Woburn, doesn't change the rest of my post though.