The International Expert Symposium on Accident Research (ESAR) will take place on 23-24 March 2021, in Hannover, Germany. ESAR is organised by the Medical School of Hannover and it is a scientific colloquium that can be seen as a platform for exchanges of information on accident research issues. The conference will focus on accident research general, accident causation, pre-crash analysis, accident reconstruction, new data sources for accident research such as video observation and EDR, injuries, regulation and consumer information.