The Harvard-Radcliffe shuttle bus service will add a bus and extend its routes to cover the Brattle St., Divinity School and Peabody Terrace areas, beginning next Monday. Buses will also run at more frequent intervals.

A revised bus schedule will be officially released on Thursday as part of the report of the Committee on Crime. Stephen S.J. Hall, vice president for administration and committee chairman, declined yesterday to detail the group's findings until after their publication.

The committee recently approved a $13,000 increase for the shuttle's budget in order to cover the cost of extending service.

Harvard's Security System

Hall said the bus has "proven itself as an essential part of the Harvard security system." He added that the use of the bus increased markedly in November and December "when things started to happen to us," a reference to the two rape-murders which occurred in the Harvard Square area at that time.

The number of passengers using the bus increased from 700 in the first week of service to the present figure of 2000 per week. Thomas F. Vacha, a spokesman for Buildings and Grounds, yesterday attributed the increase in riders to greater regularity and dependability in the shuttle service.

"Now we know which people are where, when and we can change the service accordingly," he said.

A radio, linked directly to the Harvard police headquarters, will be installed in each bus. Meanwhile, the committee is reviewing the possibility of improving the lighting along the bus route.