Cambridge MA has an ordinance which prohibits pick ups and deliveries between 9:00 PM and 7:00 AM. Nonetheless there are many violations. The rear of Harvard University's Fogg Museum has a loading dock for the many fund raising events held at the Museum.On Saturday evenings after the events some of the contractors pick up their furniture and supplies and left over foods which they can use at other events the next day. If they had to wait until legal hours they might not be able to use the same furniture two days in a row. It is a business need. Harvard cooperates with their contractors. But they make noise which affects my quiet enjoyment of my residence. That is the purpose of the noise ordinance. Currently the City solons debate an amended noise ordinance to prohibit use of leaf blowers during some periods of the year and times of day. They think that the ordinance will be enforced just because it is law. That is what politicians do, they write laws.