The IEEE Intelligent Transportation Systems Society (ITSS) organised with great success the 24th IEEE International Conference on Intelligent Transportation Systems (ITSC) which was held in Indianapolis, on 19-22 September 2021. ITSC 2021 welcomed articles and presentations in the field of Intelligent Transportation Systems, conveying new developments in theory, analytical and numerical simulation and modeling, experimentation, advanced deployment and case studies.  NTUA actively contributed with the following presentation: