PACSIM: a new dynamiv behavioural model 
                      for multimodal traffic assignment

                          E. Cornélis and Ph. L. Toint

                               Report 97/08

The present  papers provides a brief  introduction to PACSIM, a  new model for
multimodal traffic assigment.  This model is distinguished by the introduction
of  several  important  features:  full  dynamism  based  on  an  event-driven
paradigm, complete modelling of the network of information provided to network
users, multilevel network representation,  multimodal capabilities and the use
of  an explicit parametrisable  behavioural theory.   The paper  discusses the
main motivations and design concepts, and presents an illustrative application
of  PACSIM  to  advanced  incident  warning.  Some  perspectives  are  finally
outlined.