Cambridge police will enforce alternate-side parking in certain areas of the city to facilitate street cleaning, in accordance with a plan adopted earlier this week.

Acting on a proposal by City Councilor Al Vellucci, May has been designated Clean-Up Month, when every street in Cambridge will be cleaned by the city's four mechanical street sweepers. Alternate side parking is designed to allow cleaning one side of the street a night.

On the evenings when a particular street is to be cleaned, a police sound truck will exhort car-owners to park their cars according to the new plan; on the evening of even-numbered days cars must be parked on the even-numbered sides, and vice versa. Violators will be ticketed, but not, under present plans, towed away.