At the intersection of Chilton Street and Concord Avenue, there are three tribute markers for prominent Cambridge residents. It is a way for the Cambridge City Council to honor citizens who contributed to the greatness of the city. But they usually reserve an entire intersection for one person naming it the person's square. In this case there are three markers. Perhaps that burden caused a large nearby tree to fall down. Included is a sign restricting traffic with the unstated exception for Harvard vehicles. For Harvard in Massachusetts laws are optional.