Transactions on Machine Design Djamila Hamdadou, Emdjed Alnafie, Karim Bouamrane, Ikram Behilil 6 1 2018 http://www.dline.info/tmd/fulltext/v6n1/tmdv6n1_1.pdf Oran road network is taken, daily, by thousands of vehicles, some of which are TDG (Transportation of Dangerous Materials). The latter have the characteristic of transporting substances may present a hazard to people, property or to the environment. Oran a city in Algeria, developing over the years, joined its industrial area which has urbanized ignoring the associated risks constraints. Thus, its fuel storage center and distribution and its various service stations met the city. Therefore, this random extension, gave TDG roads “penetrating” the city. This town characterized by narrow and stagnant roads, and an increase in traffic lives recrudescent accidental events of traffic. The main objective of the current study is to design and develop a multi-criteria decision support system to identify the least risky paths according to a set of criteria assessed by experts in the field. In this context, a more specific objective is to provide a web application containing the developed decision support system and allowing carriers to check the system from their starting points.