I live on a private way in Somerville. According to the DPW, the city isn't allowed to use state funds for plowing or road repair. So you're pretty low on the priority list to get your street paved, though ours was redone a few years ago. In practice, it doesn't make much difference. Utilities must repair any holes they dig and the street is plowed by the city.

The big deal is that parking is limited to residents and abutters. Residents can sign a petition to exclude the abutters and erect a residents-only sign.