Based on the historical data of fossil fuel consumptions and socio- economic factors from 1990 to 2007 and making reasonable assumptions for future crude oil price, population, and GDP growth rate, the macroeconomic models were formulated to make projection for the future annual fossil fuel consumptions and GHG emissions of the transport sector in the next two decades for the BAU scenario and for the mitigation impacts of fuel switching, and highly energy efficient car options on fuel consumptions and GHG emissions.