N.J. Admin. Code § 13:20-34.1
The primary purpose of registration marks is to provide a State-issued, visible and unique alpha-numeric identification mark for display in a uniform manner on each motor vehicle registered by the Commission. Registration marks are used primarily for Commission, law enforcement, motor vehicle and traffic safety, and other identification purposes. A secondary purpose, only for those motor vehicle owners who opt for and pay the appropriate fee pursuant to 13:20-34.5(a)2, is to display personalized, State-issued, visible and unique alpha-numeric identification marks of their own request, in a uniform manner on each motor vehicle registered by the Commission. Personalized marks are also for Commission, law enforcement, motor vehicle and traffic safety, and other identification purposes. The Chief Administrator exercises sole control, in accordance with this subchapter, to determine which registration marks shall be issued.
N.J. Admin. Code § 13:20-34.1