No municipal police department may impose any quota with respect to the issuance of citations to pedestrians or summonses for motor vehicle violations upon any policeman in such department. Nothing in this section shall prohibit such department from using data concerning the issuance of such citations or summonses in the evaluation of an individual’s work performance provided such data is not the exclusive means of evaluating such performance. As used in this section, “quota” means a specified number of citations issued to pedestrians or summonses for motor vehicle violations to be issued within a specified period of time.