Natural Gas Vehicles (NGVs) Safety Regulations

Vehicles converted to operate on compressed natural gas (CNG), liquefied natural gas (LNG), or a bi-fuel system must be inspected for compliance with applicable Federal Motor Vehicle Safety Standards (FMVSS). The inspection must occur at the time of the conversion; every three years or 36,000 miles after the conversion, whichever comes first; and following any collision in which the vehicle was traveling at five miles per hour (mph) or greater. Vehicles originally designed and manufactured to use CNG or LNG must also be inspected for safety following any collision in which a vehicle was traveling at five mph or greater. Any person who performs NGV conversions must certify to the vehicle owner that the conversion does not affect any existing vehicle emissions or diagnostic systems, except as necessary for the conversion. The Kentucky Transportation Cabinet may establish regulations to qualify persons to perform safety inspections; modify FMVSS for state use; and identify converted vehicles and ensure compliance with applicable regulations. (Reference Kentucky Revised Statutes 186.752)