The concept of social sustainability is multifaceted and continues to be a topic of considerable debate, particularly with regard to its indicators and applications. The existing literature on social sustainability in transportation is limited with regard to its definition and assessment. Moreover, current approaches often neglect the subjective perceptions of individuals, prioritizing objective aspects, such as quantitative indices, in the exploration and evaluation of social sustainability in transportation. This approach often overlooks the psychological characteristics that are integral comprehending and assessing of the social sustainability in transportation systems. To address this gap, this research proposes the development of two questionnaires designed to assess social sustainability based on citizens' experiences. The objective of these tools is to quantify social sustainability in urban mobility contexts, taking into account both objective indicators and subjective dimensions. By capturing individual perspectives, the questionnaires will facilitate the design of mobility solutions that are inclusive, tailored to user needs, and capable of promoting sustainable mobility practices.