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Transport is a major sector of the UK economy. The significant place it holds reflects the fact that cars are generally seen as the most attractive means of travelling comfortably, quickly, privately and safely; that lorries enable the speedy transfer of goods on a door-to-door basis and with the minimum of double handling; and that air travel is an obvious way of saving time over long distances. Indeed, car use has been described as a barometer of personal independence and living standards, road freight as vital to the economic functioning of business, and air travel as an essential component of international communications.
However, a wide range of conflicts can be identified in the process of enabling the demand for fossil fuel-based transport - road, rail and air - to continue increasing whilst at the same time improving environmental quality. Accordingly, in the last two decades, successive governments have been attempting to strike the right balance between a strategy of investment to meet that demand and a strategy on minimizing the wide-ranging adverse consequences of doing so.  相似文献   
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