6: The TAG-l Model for France

When researchers seek to study the influence on traffic risk of factors related to mobility, the economy and road safety policies, they tend to use models that are based on the exploitation either of cross sections of a panel of regions or sites, or of chronological series (annual, monthly or daily). We directed our research at this second type of model, which is useful for: (i)evaluating the effects of road safety measures at a national level that are becoming increasingly complex; this complexity comes from spatial and temporal variations in populations affected by the measures (points system for driving licences, technical inspections of vehicles, and so on); (ii)basing the interpretation of medium and long-term traffic risk on those of mobility and the economy.