Energy use in the transportation sector is primarily for passenger travel and freight movements. We shall restrict the present discussion to that part of public passenger transportation in either case of light and high duty vehicles. The focus is to bring about an evolution toward a sustainable public transport system including oil savings, improved energy efficiency and security, and reduced GHG emissions. The baseline of the present case study stemmed, in 2002, from a request of the Syrian Ministry of Transport aiming to introduce the use of Compressed Natural Gas (CNG) and Liquefied Propane Gas (LPG) in public transport vehicles in order to get in the environmental dimension and better air quality in urban areas, within the general framework of reconciling socio-economic development with environmental protection.
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