Las encuestas de movilidad y los referentes ambientales de los transportes

the contribution of the population trips to the emission of greenhouse effect gasses, in as much as they use mechanical means of transportation, mainly the automobile, is undeniable. many works agree on measuring this contribution at about 30 percent of the total greenhouse emissions. however, different means of transportation do not contribute in the same way to those emissions. therefore, it is of the utmost importance to analyze the modal split in the travels of one population to determine the degree of participation in the environmental contamination. this paper discusses the modal split in catalonia, based on theeveryday mobility survey (2006) data, from the territorial binomial urban/rural and from the motivational category that causes them.