Abstract: Aiming at the problem that it is hard to scheduling vehicles in ITS, the characteristic and requirement of the workflow model for real-time vehicles scheduling in Urid environments which cross lots of domains and systems was presented. A meta-model of workflow was proposed for ITS vehicles scheduling. It utilizes Petri Net based flexible workflow model technique and top down layered decomposition approach to create the workflow model. And then a dynamic modifying strategy was proposed in order to suit the ideas and methods of ITS workflow modeling. At last, an algorithm was given to validate the model.

Key words: Intelligent transportation system, Workflow, Flexbility, Workflow model