The Department of Emergency Services and Public Protection shall not impose any quota with respect to the issuance of citations to pedestrians or summonses for motor vehicle violations upon any policeman in said department. Nothing in this section shall prohibit said department from using data concerning the issuance of such citation 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.