Pakistan's transport system is one of the largest sectors of economy. All GHG emissions produced as a result of combustion of fossil fuel through road transport, aviation, railways, and navigation are included in the transport sector. It has been observed during the last two decades that demand for road transport services, holding share of 13% in Pakistan's GDP, has grown manifold (Ministry of Finance, 2016). In Pakistan, registered road vehicles have increased from 2.71 million in 1990 to 18.05 million in 2015 (Figure 9). Cars and two wheelers represent approximately 82% of the total road vehicles (Ministry of Finance, 2014). It consumes around 40% of the total liquid fuel consumed in the country. About 78% of fuel used in this sector is oil- mainly gasoline and diesel. Compressed natural gas (CNG) and electricity meets the remaining 22% requirements of the transport sector (Hydrocarbon Development Institute of Pakistan, 2016). The total GHG emissions from the transport sector in 2015 were 41.197 Mt CO- eq. This is 22% of the total COeq. emissions from the energy sector and is 10% of the total GHG emissions in 2015. Of the total CO- eq. emissions from the transport sector in 2015, 36.125 Mt was emitted as CO, 0.189 Mt CO- eq. as CH, and 0.090 Mt CO- eq. was emitted as NO.