From wikipedia: Washington Street is a street originating in Boston, Massachusetts that extends southwestward to the Massachusetts-Rhode Island state line. The majority of it was built as the Norfolk and Bristol Turnpike in the early nineteenth century. It is the longest street in Boston and it remains one of the longest streets in the state of Massachusetts. Washington Street, as the first street that connected peninsular Boston to the mainland, serves as a divide where a number of cross streets change name.