  In this paper, an ontology-based approach is used to organize the knowledge
base of legal documents in road traffic law. This knowledge model is built by
the improvement of ontology Rela-model. In addition, several searching problems
on traffic law are proposed and solved based on the legal knowledge base. The
intelligent search system on Vietnam road traffic law is constructed by
applying the method. The searching system can help users to find concepts and
definitions in road traffic law. Moreover, it can also determine penalties and
fines for violations in the traffic. The experiment results show that the
system is efficient for users' typical searching and is emerging for usage in
the real-world.
