The AIIT 2nd international congress on  Transport Infrastructure and Systems in a changing world “Towards a more sustainable, reliable and smarter mobility” took place with great success on 23rd – 24th September 2019, in Rome. The objective of the Congress was to promote the knowledge of the new trends of development of mobility systems and transport infrastructures. The Congress aimed at providing a forum for discussion, interactions and exchange among researchers, scientists and engineers whose fields of interest concern transport and infrastructure engineering including traffic safety.  NTUA actively contributed with the following presentations: