North Dakota Century Code Title 39. Motor Vehicles § 39-27-18. Passenger seat

Motorcycles designed to carry more than one person must be equipped with a securely mounted seat for each passenger located to the side or rear of the driver such that the passenger seat does not interfere with the driver's control or operation of the vehicle. In the case of a two-wheel vehicle, the passenger seat must be located on the longitudinal centerline of the motorcycle.