The 9th conference of European Association for Research in Transportation (hEART) organized by the Transport, Urban Planning and Economics Laboratory (LAET), took place with great success in Lyon on 3-4 February 2021. It covered relevant areas of transportation research with focus on methods, models and planning of transport systems. The aim of the conference was to connect researchers in transport modelling, transport economics, transport engineering and transport policy with advanced practice and state of the art, including road safety applications. link NTUA actively contributed with the following paper: pdf5 Exploring driving behavior as a latent variable in safety modeling. A preliminary analysis from a driving simulator study.