One part of the recently signed Municipal Modernization Act gives towns greater rights with respect to setting speed limits. Previously the town had limited control over what the speed limit would be, because the town had to set speed limits at what 85% of the drivers were going, which was usually higher than the town wanted. this is the new provision:
Local Speed Limits / Safety Zones (Sections 193-194)
Provides municipalities with flexibility around the establishment of speed limits. Cities and towns can now establish a speed limit of 25 MPH on any roadway inside a thickly settled or business district on any way that is not a state highway. It also allows for the creation of designated safety zones on, at, or near any way in the city or town that is not a state highway, and with the approval of MassDOT if the same is a state highway. Such safety zones would have a posted speed limit of 20 MPH.