Evolution of Greenhouse Effect Gas Emissions in Road Transport sector in Spain in 1990-2009
José Antonio Sotelo Navalpotro, María Sotelo Pérez, Fernando García Quiroga

Abstract
The investigation we here present comes from the idea that road transport on its different varieties, goods and passengers, and on this last one on its two types, private and public transport comprises a sector with a remarkable socioeconomic relevance. In fact, there are estimations that settle its contribution to Spain´s GDP at an average of 7% and a maximum of 10% if own transport and production of means and infrastructures are included. Therefore, to the obvious benefits that contribute to the economy, which in a great way are reflected on its corresponding statistics, the remarkable costs it involves should be substracted not only in terms of energy dependence increase, but also on the enormous and dramatic cost due to accidentality and the problems caused in terms of contamination, soil use and infrastructure congestion. The methodological bases are settled in it, for the construction, in phases of a system of indicators that would allow evaluation and follow-up of sustainability on the transport sector in its triple dimension: economic, environmental and social; the synchronic and diacronic comparison of the indicators; the establishment of limit and critical values, and desired and goal values on realistic progressions to the desired.

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