In the city of Athens, traffic delays and high travel times are noticed due to the high levels of inner-city traffic. Consequently, sustainable mobility practices, such as enlarging sidewalks, parking management and prioritizing pedestrians and public transport are imperatively required. Within the framework of the new Sustainable Urban Mobility Plan of the city of Athens, a series of novel traffic and parking arrangements were examined, promoting public transport and active travel modes. This paper aims to assess the traffic impacts of the arrangements, examine the interventions that upgrade public space in Athens city and present an evaluation of their pilot implementation. The results indicated that, the evaluation of the pilot implementation verified the simulation model forecasts and presented significant changes in citizen habits shifting to more environmentally modes of transport.