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Within the framework of studies on accessibility, this article proposes to address the conditions offered by public transportation -- understood as a structure of opportunities that provides access to urban goods and services--, taking the Greater Buenos Aires as spatial universe. Based on a Google tool that collects data from the public transport network in its multiple modes, an indicator is constructed (travel time to the city center) which allows working on a metropolitan scale and, at the same time, provide an account of the microspatial differentials configured within it, in a cross talk with urban expansion processes and the patterns of socio-economic spatial distribution. Thus, it is observed that the unequal way in which public transport networks are distributed configures a restrictive structure of opportunities for the population residing in peripheral areas of the agglomerate and in the interstices of its growth axes, contributing to the reproduction of socio-spatial inequalities. [ABSTRACT FROM AUTHOR]