The transport is an essential element in the most activities of our society. Therefore, it must be tackled with policy at all levels, from the overall (i.e. United Nations) to the City Councils. A major importance is solving the dilemma between the policies oriented to increase, which tends to generate more transport and the environmental policies, which require the reduction of emissions. These can be difficult to fulfil if technological development to reduce emissions are outweighed by the

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... rease of transport. Public transport wants to improve continually his performance by meeting the citizen's need and expectations, through high quality of public transport by implementing, maintaining and improving an integrated management system: quality, environment, health and safety, social responsibility, information security etc.