The speed limit for all thickly-settled areas in Arlington will go from 30 miles per hour to 25 miles per hour starting May 1. The Arlington Board of Selectmen recently adopted the statutory speed limit change for all town-owned roadways within a thickly settled or business district, unless otherwise posted. The recommendation was made by the town’s Transportation Advisory Committee. Statutory speed limits apply in the absence of special speed regulations and official posted speed limits. Town officials say the change is to improve public safety for all travelers in Arlington.