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Rio de Janeiro has gone through major urban restructuration work over the last decade. Its status as host city of the 2014 World Cup and 2016 Olympic Games meant an important transformation process for most of the city. In this context, one of the most important infrastructural interventions made was the implementation of the BRTs (Bus Rapid Transit) system. In most stations, it is possible to perceive an informal dynamic of unscheduled uses and ephemeral appropriations, using objects or devices of informal commerce that occupy the "interstices" forgotten by the system. This insurgency reclaims new possibilities for interpreting urban spaces, once they reveal their potential, offering alternative products and services in the context of daily urban mobility. The concept of "interstitial ity" is proposed in order to name the "in-between", or the gaps in the BRT system which, in practice, have diffuse limits. What sets out this interstitial dimension are those who inhabit and use the gaps, through ephemeral appropriation of the mobility infrastructure and its surroundings. This work, through fieldwork, photographic survey, a categorization of the observed behaviors and the ephemeral supports detected, complemented with a bibliographic discussion, observes those ephemeral appropriations in the interstitial spaces, mainly of the TransOeste Corridor Jardim Oceânico Intermodal Station of the BRT system of Rio de Janeiro. The work concludes that the phenomenon of interstitial appropriation must be considered as part of the urban systems, because, in the contemporary city, it is that insurgent and informal ephemerality that often responds to the demands and needs of our daily lives. [ABSTRACT FROM AUTHOR]

This article looks at ephemeral situations adopted in the appropriation of public spaces in Olaria, Ramos and Bonsucesso, suburbs of the city of Rio de Janeiro. These situations were revealed in the context of teaching Urban Design in the Architecture and Urbanism course, motivated by concerns about a coherent intervention that considers the city's contemporary complexities. Our approach stemmed from a spatial analysis on a micro scale, that allows observing the effects of Urban Form for those who experience it, considering the relationship between materiality and daily events. The theoretical basis of the research is the concept of singularity, understood as the result of inventiveness to adapt to the urban condition, dominated by hegemonic processes, which creates density in the urban environment and permanence for local agents. Given the multiple ephemeral singular situations found in our investigation, we also incorporated the concept of ephemeral architecture into our theoretical-methodological framework as a fleeting, organic and flexible spatiality, that requires few financial or human resources, and relies on bottom-up action. In contrast, with the already studied micro-practices, we consider the peculiarity of ephemeral situations in Rio de Janeiro's suburbs involving socioeconomic characteristics. This opens the door for ephemeral architecture to contribute towards urban social and spatial inclusion. For that reason, however, we must consider the difficulty for Urban Design to deal with informality, environmental and landscape decay, as well as precarious infrastructure. For that reason, it is important to include a system of design rules to guide spatial appropriation, organizing public space by private activities and the exchange of working practices with circulation flows, as well as adopting solutions to deal with the daily reinstallation of devices. [ABSTRACT FROM AUTHOR]