New Jersey Statutes Title 39. Motor Vehicles and Traffic Regulation 39 § 5-25

Any law enforcement officer may, without a warrant, arrest any person violating in his presence any provision of chapter 3 of this Title,  1 or any person, other than a motorman or person having control of a street car or auto bus, running upon a route approved by the Board of Public Utilities, violating in his presence any provision of chapter 4 of this Title.  2A law enforcement officer may arrest without a warrant any person who the officer has probable cause to believe has operated a motor vehicle in violation of R.S. 39:4-50 or section 5 of P.L. 1990, c. 103 (C. 39:3-10.13), regardless of whether the suspected violation occurs in the officer's presence. The exemption from arrest of a motorman or person having control of a street car or auto bus, as conferred herein, shall not operate to prevent his arrest, however, for a violation of R.S. 39:4-50. The arresting officer shall bring any person so arrested before any judge of the municipal court of the municipality wherein the offense is committed, or before the director at any place designated as his office. If the arrest is for a violation of R.S. 39:4-50, the arresting officer may, if no judge, clerk or deputy clerk is available, detain the person arrested, either in any police station, lockup or other place maintained by any municipality for the detention of offenders or in the common jail of the county, for such reasonable time as will permit the arresting officer to obtain a warrant for the offender's further detention, which temporary detention shall not exceed 24 hours from the time of the arrest. If the arrest is for a violation of any other provision of this subtitle, the person arrested shall be detained in the police station or municipal court until the arresting officer makes a complaint and a warrant issues.

Any law enforcement officer may, instead of arresting an offender as herein provided, serve upon him a summons.