In Stamford, the speeding limit is 25mph on any residential road. For the main roads, the speed limits vary. Some roads can vary from 45mph, 40mph, and others, 30mph. Speed limits in some areas vary with time. For instance, along Route 7 surrounding Wilton High School, the speed limit is usually 50mph, but drops to 30mph between 7am to 9am and from 2pm to 4pm. Search rental cars on KAYAK