To curb vehicular pollution, the government has notified rules for retrofitment of hybrid electric system, or electric kit, for vehicles. This applies to the vehicles that meet emission norms and are run on either diesel or gasoline only. The Retrofitment of hybrid electric system kit to vehicles having Gross Vehicle Weight not exceeding 3,500 kg shall be permitted if it conforms to Bharat Stage-II or subsequent emission norms, if it was not retrofitted earlier, Ministry of Road Transport and Highways said in the notification. It mentions that the installation of type approved hybrid electric system kit shall be done only by an installer authorised by the manufacturer or supplier of such kits. The rules – Central Motor Vehicles (Seventh Amendment) Rules, 2016 — were notified following amendment in the Central Motor Vehicles Rules, 1989.