N.J. Stat. Ann. § 39:8-78

20. On the first day of the forty-eighth month after this act takes effect, the Attorney General, in consultation with the Commissioner of Environmental Protection, the commission, and the Commissioner of Transportation, shall submit to the Governor and to the members of the Legislature a report assessing the effectiveness of the programs required by this act and the necessity and feasibility of providing for periodic centralized emissions inspections of diesel buses, heavy-duty diesel trucks, and other diesel-powered motor vehicles.