"The communication proposes to discuss results from an exploratory project that states on urban ambiances underlying feeling studies during pedestrian travels, in the context of an urban project city qualification. Current policies on urban renewal, environmental awareness and outlined urban planning tools (such as Aalborg plan) require strengthening on mobility and further research through the pedestrian metric. Such a metric means to understand urban mobility underpinned not only by the destinations but also by the space of displacement itself. Over the last decade, there has been increasing interest in the characteristics of the physical environment and walkable environment such as neighborhood level planning attributes i-e. density, street-connectivity, mixity, the presence of furniture, aesthetic qualities; levels of disorders, etc. Most of them propose to describe and make inventory of walkable streets. However, the process of mobility has to be understood in a more transactional approach, considering as much psychological and social dimensions as physical characteristics. In this perspective, we suggest to explore the notion of "urban ambiance impression". It is defined as a psychological process combining descriptive, evaluative and connotative dimensions of the representation of environmental ambiance. It also allows to appraise individual-urban environment transactions. To explore and test this notion, a survey undertaken in an interdisciplinary approach was carried out in Strasbourg (East of France), in a neighborhood engaged in an urban renewal. The selected urban area is strongly structured because of an urban design made of hexagonal stitches organizing main streets, habitats and pedestrian roads. A sample of 20 people (inhabitants vs passers-by) was interviewed in situ matching several technics of collect of data: 1/ a commentary trip collecting verbal and visual impressions of ambiance (speech and photographs) during two stages (an imposed destination trip for the way out, an individual free trip for the return); for every trip only 12 photographs could be taken (6 photographs for the imposed trip and 6 for the free trip) ; 2/ an individual post-interview just after the moving interview (subjects had to answer personal questions and comment and describe pictures). A part of results will be discussed according to repulsive vs attractive dimensions of urban ambiances attempting to show the limits or ambiance barriers.Another part of results will attempt to debate about the role of this psychological process according to environmental preferences and spatial identity. Mainly, we will have a go on how the collective memory and the personal involvement of the habitants vs passers-by may contribute in explaining the formation of ambiance impressions and the assimilated socio-spatial categorization."