| UN R143 HD Dual Fuel Retrofit Systems | Heavy-Duty Dual Fuel Retrofit Systems | Uniform provisions concerning the approval of Heavy Duty Dual-Fuel Engine Retrofit Systems (HDDF-ERS) to be installed on heavy duty diesel engines and vehicles HD Dual Fuel Retrofit Systems Heavy-Duty Dual Fuel Retrofit Systems UN Regulation No. 143 UN R143 | UNR | 143 | |
| UN R24 Diesel Engine Emissions | C.I. Engine Emissions and Net Power | Uniform Provisions Concerning: I. The Approval of Compression Ignition (C.I.) Engines with regard to the Emission of Visible Pollutants; II. The Approval of Motor Vehicles with regard to the Installation of C.I. Engines of an Approved Type; III. The Approval of Motor Vehicles Equipped with C.I. Engines with regard to the Emission of Visible Pollutantns by the Engine; IV. The Measurement of Power of C.I. Engine Diesel Engine Emissions C.I. Engine Emissions and Net Power UN Regulation No. 24 UN R24 | UNR | 24 | |
| UN R115 LPG/CNG Retrofit Systems | Liquefied Petroleum and Compressed Natural Gas Retrofit Systems | Uniform Provisions Concerning the Approval of: I Specific LPG (Liquefied Petroleum Gases) Retrofit Systems to be Installed in Motor Vehicles for the Use of LPG in their propulsion system II. Specific CNG (Compressed Natural Gas) Retrofit Systems to be Installed in Motor Vehicles for the Use of CNG in their propulsion system LPG/CNG Retrofit Systems Liquefied Petroleum and Compressed Natural Gas Retrofit Systems UN Regulation No. 115 UN R115 | UNR | 115 | |
| UN R83 Motor Vehicle Emissions | Motor Vehicle Emissions | Uniform Provisions Concerning the Approval of Vehicles with regard to the Emission of Pollutants According to Engine Fuel Requirements Together with R49, Regulation 83 addresses vehicle emissions. R83 covers emissions from all light vehicles (M1/N1) regardless of engine type and from heavier vehicles only if equipped with a gasoline engine. Under certain circumstances, R83 or R49 can apply to light vehicle CNG/LPG engines as well as to medium passenger and commercial vehicles (M2/N2) equipped with diesel engines. R83 also contains provisions specific to hybrid variations of the vehicles under its purview. Motor Vehicle Emissions Motor Vehicle Emissions UN Regulation No. 83 UN R83 | UNR | 83 | |
| UN R67 LPG Equipment | Liquefied Petroleum Gas Equipment | Uniform Provisions Concerning the Approval of: I. Specific Equipment of Motor Vehicles Using Liquefied Petroleum Gases in their Propulsion System II. A Vehicle Fitted with Specific Equipment for the Use of Liquefied Petroleum Gases in its Propulsion System with regard to the Installation of such Equipment LPG Equipment Liquefied Petroleum Gas Equipment UN Regulation No. 67 UN R67 | UNR | 67 | |
| UN R110 CNG/LNG System Components | Compressed and Liquefied Natural Gas System Components | Uniform Provisions Concerning the Approval of: I. Specific components of motor vehicles using compressed natural gas (CNG) and/or liquefied natural gas (LNG) in their propulsion system; II. Vehicles with regard to the installation of specific components of an approved type for the use of compressed natural gas (CNG) and/or liquefied natural gas (LNG) in their propulsion system. CNG/LNG System Components Compressed and Liquefied Natural Gas System Components UN Regulation No. 110 UN R110 | UNR | 110 |