This lecture explores the impact of Big Data on mobility planning, discussing the historical milestones reached in 2008, the three properties of Big Data (Volume, Variety, Velocity), and the political challenges related to data management. It delves into how Big Data enables the measurement of various mobilities, the identification of patterns for transport optimization, and the association of structured and unstructured data from diverse sources. The promises and limitations of Big Data in mobility are also analyzed, emphasizing the need for detailed data analysis. The presentation concludes by highlighting the importance of entering data and calculations for effective mobility planning.