OECD - IRTAD International Seminar on Road Traffic and Accident Data Needs for the New Century Vienna, 25-26 September 2000 TRAFFIC AND ACCIDENT ANALYSIS PRIORITIES AND DATA AVAILABILITY IN EUROPEAN COUNTRIES Dr. George Yannis Department of Transportation Planning and Engineering National Technical University of Athens. Abstract Using the results of two questionnaire-based surveys, this research aims to show the traffic and accident analysis priorities prevailing today in the European countries in conjunction with the availability of data on accident and exposure at European level. The analysis of the surveys’ results through detailed comparative Tables showed that, today, model-based road accident analysis at European level has a great potential. Priorities and necessities for model- based road accident analysis at European level are rather well defined and sufficiently converging among experts from the various countries. Moreover, a lot of useful accident data variables are available nowadays for all or almost all countries, providing sufficient information in order to fulfil these priorities and necessities for modelling in road accident analysis. However, further work is required, especially in the field of availability and compatibility of accident, exposure and additional information variables and the respective values contained in these variables. Key-words: road accident data, road traffic data, road accident analysis, exposure data - 1 -