A Sustainable Urban Mobility Plan (SUMP) is a strategic (long period) transportation plan aimed to improve welfare of peoples and workers living in the city and in its surrounding area. The SUMP moves the focus from traffic (vehicles) to people toward a sustainable mobility jointly with the quality of life. According to the recent European Guidelines, this plan has to be built on existing planning practices and after considerating: the integration, the participation, and evaluation.

In absence of a detailed national guideline implementing SUMP, the aim of this paper was to apply an innovative theoretical decision-making approach for the development of the Naples (Italy) SUMP. This case study is interesting because the city is the third largest Italian city and the metropolitan area with the highest population density.

In 2016, the city has ratified a first formalization of acts: ‘the analysis of mobility system’ and ‘the statement of strategic objectives’.