Cambridge street cleaners are six weeks behind schedule in clearing away salt and sand left after the recent blizzards, Public Works Commissioner Thomas F. Dunphy announced at yesterday's City Council meeting. The Council appointed a committee to investigate ways to improve the situation.

Cars parked overnight, especially on side streets, according to Dunphy, pose the greatest problem for the sweepers. "If you could get the cars moving," Dunphy said, "the city's four mechanical sweepers could do many more gutter-miles a night."

Councilor Alfred Vellucci suggested that parking could be discouraged by signs on alternate side of streets when the cleaning operation is scheduled to take place. Councilor Joseph A. De Guglielmo '29 insisted, however, that the problem could only be handled if an ordinance authorized police to tow away the cars.

The Cambridge parking problem will remain critical, Dunphy predicted, since Cambridge has more automobiles than most neighboring towns. Another councilor, Edward A. Crane, said that the congestion on public streets could be relieved by increasing the number of low-rate parking lots.