The Urban Expansion Corridors (UEC) became the object of this research after analysing the relationship between transport infrastructures –particularly roads– and urban expansion processes. Within the framework of Mid-sized cities in Latin America, whose common problems respond to specific logics of production and socio-spatial reproduction, the case study proposed here corresponds to the Greater Santa Fe (GSF-Argentina). To clarify the formation process of the GSF’s UEC, we have adopted a mixed methodology –which includes both quantitative and qualitative approximations, and have proposed an approach typical of the field of urban studies, and a «long term» historiographic perspective. The conclusions aim to discuss the operability of this object of study, as a spatial form that acquires a certain entity in contemporary modes of urban living.