New Jersey Statutes Title 48. Public Utilities 48 § 16-2.4

The owner of an autocab shall cause to be displayed on the body of the vehicle the taxi license number issued to that vehicle. The number shall be three inches in height and located in the center of the rear quarter panels on the driver and passenger sides and the rear center line of the trunk of the vehicle. Each autocab shall display on each rear door of the autocab the name of the municipality or municipalities which has issued the autocab a taxi license in letters three inches in height.