Transportation of dangerous goods or hazardous material is a sensible security issues in the transportation sector. Dangerous goods can be transported by various means or modes (maritime, air freight, road and railway) but transportation of dangerous goods by road and rail are the most common modes. Road accidents involving dangerous goods can have critical impacts on population and environment present around the incident area. The risk of civilian casualties is increased in urban areas because of the high density of population. The danger of cascading effects in presence of industrial plants deserves also to be considered. It is therefore highly important to identify any action or technology, which can reduce accidents and improve the safety. This chapter, with the title "Legislative Context and Governance Principles for Dangerous Goods Transportation (DGT) Integrated Risk Management" is first reviewing the current state of the legislation, its rules and its limitations. It is then considering how ICT/ITS new technologies can improve the DGT monitoring, for a better dangerous goods transportation management. This assessment is based on past experiences of the Joint Research Center involved in various demonstration and pilot projects. That first part concluding that, even if available and reliable, the advanced technologies for tracking and tracing are still not deployed, the second part will analyze what is missing for large scale deployment, and assess what are the challenges of an harmonized DGT governance at EU level.